fix a typo [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46318 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2014-06-02 13:47:44 +00:00 · 2014-06-02 13:47:44 +00:00 · d3c07588a7
--- a/2
+++ b/2
@ -13,7 +13,7 @@ Mon Jun  2 15:50:24 2014  Koichi Sasada  <ko1@atdot.net>

 Mon Jun  2 12:26:08 2014  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>

-	* CONTRIBUTING.md: added contibuting guide for github. [fix GH-625]
+	* CONTRIBUTING.md: added contributing guide for github. [fix GH-625]

 Mon Jun  2 07:30:33 2014  Tanaka Akira  <akr@fsij.org>