Fix e-mail link

Author: hartwork

text/01_Introduction/0_ Introduction.markdown

@@ -36,7 +36,7 @@ work in Git.
 ### Feedback and Contributing ###
 
 At any point, if you see a mistake or want to contribute to the book, you can 
-send me an email at [[email protected]](mailto://[email protected]), or you
+send me an email at [[email protected]](mailto:[email protected]), or you
 can clone the source of this book at 
 [http://github.com/schacon/gitbook](http://github.com/schacon/gitbook)
 and send me a patch or a pull-request.