Merge pull request #30 from nexxTM/patch-1

Updated zsh installation
diff --git a/README.markdown b/README.markdown
index c4ff4e0..b0b70fb 100644
--- a/README.markdown
+++ b/README.markdown
@@ -46,8 +46,8 @@
 
 To achieve git-flow completion nirvana:
 
- 0. Update your zsh's git-completion module to the newest verion --
-    [available here](http://zsh.git.sourceforge.net/git/gitweb.cgi?p=zsh/zsh;a=blob_plain;f=Completion/Unix/Command/_git;hb=HEAD).
+ 0. Update your zsh's git-completion module to the newest version --
+    [available here](http://sourceforge.net/p/zsh/code/ci/master/tree/Completion/Unix/Command/_git). Optional if you have an up-to-date version of zsh.
 
  1. Install `git-flow-completion.zsh`. Either: