[extractor/common] Document release_date field
authorSergey M․ <dstftw@gmail.com>
Sat, 26 Sep 2015 15:07:54 +0000 (21:07 +0600)
committerSergey M․ <dstftw@gmail.com>
Sat, 26 Sep 2015 15:07:54 +0000 (21:07 +0600)

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