Make the links manually.

I thought Markdown did support URL recognition automatically.
diff --git a/README.mdown b/README.mdown
index 7f472e7..cdf9d69 100644
--- a/README.mdown
+++ b/README.mdown
@@ -57,7 +57,7 @@
 contributors, please see the [AUTHORS](AUTHORS) file.
 
 Any questions, tips, or general discussion can be posted to our Google group:
-http://groups.google.com/group/gitflow-users
+[http://groups.google.com/group/gitflow-users](http://groups.google.com/group/gitflow-users)
 
 
 License terms
@@ -74,7 +74,7 @@
 For the best introduction to get started to `git flow`, please read Jeff
 Kreeftmeijer's blog post:
 
-http://jeffkreeftmeijer.com/2010/why-arent-you-using-git-flow/
+[http://jeffkreeftmeijer.com/2010/why-arent-you-using-git-flow/](http://jeffkreeftmeijer.com/2010/why-arent-you-using-git-flow/)
 
 
 ### Initialization