doc/contributors.rdoc: [DOC] update

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60570 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

doc/contributors.rdoc

@@ -609,7 +609,7 @@ Joshua Stowers
 Marcus Stollsteimer (stomar)
 * committer
 * a maintainer of www.ruby-lang.org
-* patches for cgi (HTML5 tag maker), bigdecimal, and others
+* patches for cgi (HTML5 tag maker), numeric.c, bigdecimal, ostruct.rb, prime.rb, and others
 * documentation
 
 Adam Strzelecki