update gem source

ser1zw · ser1zw · commit 409d57381979 · 2013-03-03T00:27:47.000+09:00
diff --git a/Gemfile b/Gemfile
@@ -1,4 +1,4 @@
-source :gemcutter
+source 'https://rubygems.org'
 
 group :development do
   gem "hoe"
