* 53.0.4 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 0cbd1141: Merge pull request #258 from
    michamos/reference-builder-split-pubnote
    MINOR 219ec2f2: builders: split journal letter in ReferenceBuilder

* 53.0.3 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 96fe1f51: Merge pull request #256 from
    jacquerie/handle-journal-letter-split
    MINOR 7672e6e3: utils: handle journal letter split
    MINOR 115c194b: tests: fix E704
    MINOR 1287d121: tests: ignore E501

* 53.0.2 "Micha Moskovic <michamos@gmail.com>"
    MINOR ebffef01: Merge pull request #257 from michamos/builder-fix-doi-error
    MINOR 9d412ac0: builders: handle None in LiteratureBuilder.add_doi

* 53.0.1 "Micha Moskovic <michamos@gmail.com>"
    MINOR af93fb02: Merge pull request #239 from
    michamos/improve-classify_field
    MINOR 77989fb3: utils: improve classify_field

* 53.0.0 "Micha Moskovic <michamos@gmail.com>"
    MAJOR 2cf2fee0: Merge pull request #253 from
    michamos/require-url-and-datetime-format
    MINOR f043012f: global: validate date-time format
    MINOR 58620316: hep: make url required for documents and figures
    FIXED ISSUES: https://github.com/inspirehep/inspire-schemas/issues/252

* 52.0.0 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MAJOR 65332c61: Merge pull request #251 from michamos/validate-date-format
    MINOR 8d983485: api: validate date format

* 51.0.8 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 05b58c45: Merge pull request #249 from michamos/relax-page-artid
    MINOR 67830162: utils: relax artid decision in split_page_artid

* 51.0.7 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR f4a81370: Merge pull request #248 from
    michamos/fix-references-multiple-pubnotes
    MINOR e0e3fbe2: builders: better handling of reference pubnotes

* 51.0.6 "Micha Moskovic <michamos@gmail.com>"
    MINOR 23e5c928: Merge pull request #247 from
    michamos/add-editorialnote-material
    MINOR db1cf15c: elements/material: add editorial note

* 51.0.5 "Micha Moskovic <michamos@gmail.com>"
    MINOR bfe34c5d: Merge pull request #246 from
    michamos/fix-literature-builder-repr
    MINOR 74d97d3b: builders: correct __repr__ of LiteratureBuilder

* 51.0.4 "Micha Moskovic <michamos@gmail.com>"
    MINOR 1116c1d3: Merge pull request #245 from michamos/handle-license
    MINOR 0cebfd57: builders: preserve license when no URL

* 51.0.3 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 2c25919b: Merge pull request #244 from michamos/handle-license
    MINOR 392eca1b: builders: get license abbreviation from URL

* 51.0.2 "Micha Moskovic <michamos@gmail.com>"
    MINOR 729b04d9: Merge pull request #243 from
    ammirate/use_normalize_author_name
    MINOR bcde94fc: reference_builder: use `normalize_author_name`.

* 51.0.1 "Micha Moskovic <michamos@gmail.com>"
    MINOR 4ecbf59d: Merge pull request #242 from michamos/builder-improvement
    MINOR 384c219e: builders: perform doi normalization in LB
    MINOR cd420b65: builders: normalize collaboration string in LB
    MINOR 6f671a86: builders: scrub material only in LiteratureBuilder

* 51.0.0 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MAJOR 5a286d96: Merge pull request #241 from michamos/kill-_fft
    MINOR 05b293a8: hep: remove _fft field

* 50.0.5 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 7b6d7d45: Merge pull request #240 from michamos/builder-add-keywords
    MINOR d050b3ac: builders: add keywords to LiteratureBuilder

* 50.0.4 "Micha Moskovic <michamos@gmail.com>"
    MINOR 0567f4c6: Merge pull request #235 from
    michamos/update-arxiv-categories
    MINOR 8ed24e99: elements/arxiv_categories: also add eess.*

* 50.0.3 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR cea51f09: Merge pull request #237 from
    jacquerie/make-isbn-patterns-uniform
    MINOR 078a5966: hep: make all patterns of ISBNs the same

* 50.0.2 "Micha Moskovic <michamos@gmail.com>"
    MINOR 1b1b75a6: Merge pull request #238 from
    jacquerie/dont-use-normalize_isbn
    MINOR e8449beb: builders: don't use normalize_isbn

* 50.0.1 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 906513e6: Merge pull request #236 from
    iulianav/move-dojson-arxiv-utils-to-schema
    MINOR 214a17e8: utils: refactor classify_field
    MINOR ecd15f13: utils: add arXiv utils

* 50.0.0 "Micha Moskovic <michamos@gmail.com>"
    MAJOR 968ad6c3: Merge pull request #234 from
    michamos/update-arxiv-categories
    MINOR 50725fca: elements/arxiv_categories: update categories

* 49.0.0 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MAJOR cdfff3a6: Merge pull request #232 from
    michamos/kill-special-collections
    MINOR 74705739: global: handle _collections directly

* 48.0.6 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 4d2f8827: Merge pull request #231 from michamos/add-curated-flag
    MINOR c10c6e1a: builders: add set_curated to LiteratureBuilder

* 48.0.5 "Micha Moskovic <michamos@gmail.com>"
    MINOR 09383bf1: Merge pull request #230 from michamos/integrate-pr/222
    MINOR 99a6687f: utils: configure ignored titles
    MINOR e8919ebb: utils: improve author name normalization function
    FIXED ISSUES: https://github.com/inspirehep/inspire-schemas/issues/222

* 48.0.4 "Micha Moskovic <michamos@gmail.com>"
    MINOR 300902b4: Merge pull request #228 from michamos/enrich-make_author
    MINOR a9c3e656: builders: add missing fields to make_author

* 48.0.3 "Micha Moskovic <michamos@gmail.com>"
    MINOR f0a7f9ff: Merge pull request #229 from david-caro/add_hep_subtitle
    MINOR eeedd992: literature: add subtitle parameter to add_title

* 48.0.2 "Micha Moskovic <michamos@gmail.com>"
    MINOR a98fe5dd: Merge pull request #227 from
    michamos/build-raw-affiliations
    MINOR 7d4abf59: builders: make source optional
    MINOR 9b0d3c47: builders: add raw_affiliations to LiteratureBuilder

* 48.0.1 "Micha Moskovic <michamos@gmail.com>"
    MINOR 341dcc40: Merge pull request #224 from michamos/add-curated-flag
    MINOR b76084d6: hep: add curated flag

* 48.0.0 "Micha Moskovic <michamos@gmail.com>"
    MAJOR 36bb1791: Merge pull request #223 from
    michamos/finalize-journal-schema
    MAJOR ca247780: journals: require journal and short titles

* 47.0.0 "Micha Moskovic <michamos@gmail.com>"
    MAJOR 2ec0d1c3: Merge pull request #216 from inspirehep/docstests
    MINOR 60c97538: journals: finalize schema
    MINOR 2fc7a097: element/reference: fix documentation

* 46.0.3 "David Caro <david@dcaro.es>"
    MINOR 6d3b6d4b: Merge pull request #220 from
    david-caro/fix_unicode_normalize_author
    MINOR 3d544e56: utils.normalize_author_name: fix unicode handling
    MINOR 2962eb20: utils.normalize_author_name: add unicode test

* 46.0.2 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR acaffd7b: Merge pull request #214 from
    iulianav/fix-utils-name-normalization
    MINOR 9d935244: utils: improve author name normalizer

* 46.0.1 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 989905bb: Merge pull request #218 from michamos/unicode-dashes
    MINOR 8a963f83: utils: support unicode dashes in split_page_artid

* 46.0.0 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MAJOR f6c0f23d: Merge pull request #217 from
    michamos/reference-report-numbers
    MINOR 642d793c: element/references: allow several report_numbers

* 45.0.2 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 2856417b: Merge pull request #208 from michamos/improve-raw-refs
    MINOR b98e395a: builders: properly handle source for raw_refs

* 45.0.1 "Micha Moskovic <michamos@gmail.com>"
    MINOR 25c698cd: Merge pull request #206 from
    michamos/integrate-reference-builder
    MINOR 9aa08d81: api: expose ReferenceBuilder

* 45.0.0 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MAJOR 4fcad324: Merge pull request #205 from
    michamos/integrate-reference-builder
    MINOR 0726a54d: builders: copy reference builder from inspire-next
    MINOR 4d989b24: builders: adapt code to new location
    MINOR 1a213a36: utils: validate can take schema dictionary
    MINOR 0271fa7b: builders: improve spacing in references

* 44.0.0 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MAJOR 9c32c34b: Merge pull request #204 from
    jacquerie/kill-normalize_date_iso
    MINOR a7aa3dc4: utils: remove normalize_date_iso

* 43.0.2 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR a35bccb6: Merge pull request #203 from
    jacquerie/test-add_figure-and-add_documents
    MINOR 8809446f: tests: add tests for add_figure and add_documents

* 43.0.1 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 938263d8: Merge pull request #202 from
    zzacharo/add-new-fields-builder
    MINOR 2cc3ebab: builder: add methods for figures and documents

* 43.0.0 "David Caro <david@dcaro.es>"
    MAJOR cfcf1f71: Merge pull request #201 from michamos/handle-files
    MINOR b18cee88: hep: handle files properly
    FIXED ISSUES: https://github.com/inspirehep/inspire-schemas/issues/147

* 42.0.1 "Micha Moskovic <michamos@gmail.com>"
    MINOR 29652e63: Merge pull request #199 from
    michamos/document-HAL-private-notes
    MINOR d676fce5: hep: clarify _private_notes description

* 42.0.0 "Samuele Kaplun <Samuele.Kaplun@cern.ch>"
    MAJOR 68f4dba2: Merge pull request #198 from kaplun/no-corrigendum
    MINOR a777ad02: Revert "material: add corrigendum"

* 41.0.7 "Samuele Kaplun <Samuele.Kaplun@cern.ch>"
    MINOR a2fec5fb: Merge pull request #197 from kaplun/revert
    MINOR e041006c: Revert "id: adding support for OSTI"

* 41.0.6 "Samuele Kaplun <Samuele.Kaplun@cern.ch>"
    MINOR e060d4d4: Merge pull request #196 from kaplun/OSTI
    MINOR 8f6159d7: id: adding support for OSTI

* 41.0.5 "Samuele Kaplun <Samuele.Kaplun@cern.ch>"
    MINOR 60a340a1: Merge pull request #195 from kaplun/corrigendum
    MINOR 264e4c7c: material: add corrigendum

* 41.0.4 "Micha Moskovic <michamos@gmail.com>"
    MINOR 96b74f97: Merge pull request #194 from
    michamos/add-new-arxiv-category
    MINOR 71c78276: elements/arxiv_categories: add physics.app-ph

* 41.0.3 "Micha Moskovic <michamos@gmail.com>"
    MINOR c4d03e85: Merge pull request #191 from
    jacquerie/allow-failures-on-python-3
    MINOR 1ea109d1: travis: allow failures on Python 3
    MINOR 5300f3cd: travis: bump Python 3 build from 3.5 to 3.6

* 41.0.2 "Jacopo Notarstefano <jacopo.notarstefano@gmail.com>"
    MINOR 4f3ae040: Merge pull request #193 from
    michamos/relax-experiment-constraints
    MINOR c9d2886e: experiments: relax constraints on required fields

* 41.0.1 "Micha Moskovic <michamos@gmail.com>"
    MAJOR 775f6f0d: Merge pull request #189 from
    jacquerie/relax-constraint-on-institutions
