Clean up contribution guidelines in README

Removed incomplete line from the contribution guidelines.

Author: Fred-Vatin

README.md

@@ -54,7 +54,6 @@ That’s why I recommend to watch this repository and star ⭐ to easily find th
 
 - If you are sure you found a bug, open an [issue](https://github.com/Fred-Vatin/yt-playlist-filter/issues)
 - If you want to ask something, get help, talk and share something with others about this user script, open a [discussion](https://github.com/Fred-Vatin/yt-playlist-filter/discussions)
-- If you
 
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