Update PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,9 +2,3 @@
 - [ ] Bug fix
 - [ ] Refractor
 - [ ] Custom <!-- Please specify -->
-
-<!-- https://github.com/ytdl-org/youtube-dl/blob/master/.github/PULL_REQUEST_TEMPLATE.md?plain=1 -->
-### In order to be merged, each piece of this code must be released under public domain or under the [Unilicense](http://unlicense.org/). Check one of the following options:
-
-- [ ] I am the original author of this code and I am willing to release it under Unlicense
-- [ ] I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)