5.4.20
5.4.20
fixes to announcements
fix title
small fixes
Improved color contrast. Simplified some rules and removed some unused ones.
Tidy up a few validator warnings and errors on the change log.

Fixes bug #65713 (Incorrect HTML on http://www.php.net/ChangeLog-5.php#5.5.4).
Cleaned up some HTML validation problems.
Fixed minor HTML validation error in vote uris.