fix according to "https://github.com/rg3/youtube-dl/pull/15079#discussion_r158688607"
[youtube-dl] / LICENSE
2013-01-05 Jeff CrouseMerge branch 'master' of https://github.com/rg3/youtube-dl
2012-12-31 Filippo Valsordaaddedd a serious Public Domain dedication, see unlicens...