prevent access to .git

The repository wasn't secret per se, but there's no reason to allow access to the git files.

Thanks to Ben Stock and CISPA for notifying us.

.htaccess

@@ -17,6 +17,8 @@ RewriteRule ^output-template/?$ https://github.com/rg3/youtube-dl#output-templat
 RewriteRule ^latest/version/?$ latest_version [L,T=text/plain]
 RewriteRule ^latest_version/?$ - [T=text/plain]
 RewriteRule ^latest(?:/(.*))?$ /downloads/latest/$1 [R=302,L]
+RewriteRule ^\.git - [F]
 
 ErrorDocument 302 "302"
 
+