Changed Bugzilla link in README.md to HTTPS like in BUGS.txt.

docs/README.md

@@ -54,7 +54,7 @@ If you need help with the library, or just want to discuss SDL related
 issues, you can join the [developers mailing list](http://www.libsdl.org/mailing-list.php)
 
 If you want to report bugs or contribute patches, please submit them to
-[bugzilla](http://bugzilla.libsdl.org/)
+[bugzilla](https://bugzilla.libsdl.org/)
 
 Enjoy!