[.htaccess] Add short URL yt-dl.org/donate

.htaccess

@@ -6,5 +6,6 @@ RewriteRule ^ip/?$ ip.php
 RewriteRule ^bugs?/? https://github.com/rg3/youtube-dl/issues [R=302,L]
 RewriteRule ^reporting/? https://github.com/rg3/youtube-dl/blob/master/README.md#bugs [R=302,L,NE]
 RewriteRule ^update$ https://github.com/rg3/youtube-dl/blob/master/README.md#how-do-i-update-youtube-dl [R=302,L,NE]
+RewriteRule ^donat(e|ions)$  http://rg3.github.io/youtube-dl/donations.html [R=302,L]