loongson/pypi: links for tiddlywebplugins-relativetime

loongson/mirror tiddlywebplugins.relativetime-0.5.tar.gz
loongson/mirror tiddlywebplugins.relativetime-0.4.tar.gz
loongson/mirror tiddlywebplugins.relativetime-0.3.tar.gz
loongson/mirror tiddlywebplugins.relativetime-0.2.tar.gz