loongson/pypi: links for html5lib-to-markdown

loongson/mirror html5lib_to_markdown-0.0.6.tar.gz
loongson/mirror html5lib_to_markdown-0.0.5.tar.gz
loongson/mirror html5lib_to_markdown-0.0.4.tar.gz
loongson/mirror html5lib_to_markdown-0.0.3.tar.gz