Add #654 to history

Issue #654 removed redundant (useless) certificates that aren't needed
to connect to https://rubygems.org.  This was committed in @22e5981.

Fixes #654

Author: drbrain

History.txt

@@ -7,6 +7,8 @@ Bug fixes:
 * Added the Verisign Class 3 Public Primary Certification Authority G5
   certificate and its intermediary to follow the s3.amazonaws.com certificate
   change.  Fixes #665 by emeyekayee.  Fixes #671 by jonforums.
+* Remove redundant built-in certificates not needed for https://rubygems.org
+  Fixes #654 by Vít Ondruch.
 
 === 1.8.26 / 2013-09-24