Note about cgit url [ci skip]

testing svn hook by this commit

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67673 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

README.md

@@ -56,6 +56,8 @@ to see the list of branches:
 
     $ git ls-remote https://github.com/ruby/ruby.git
 
+You may also want to use https://git.ruby-lang.org/ruby.git for better latency.
+
 ## Ruby home page
 
 https://www.ruby-lang.org/