Merge pull request #98 from weeger/patch-1

Add missing library on install

README.md

@@ -25,7 +25,7 @@ It browses the repository and outputs html page with statistics.
 
 ### Ubuntu
 
-    $ sudo apt-get install ruby ruby-dev
+    $ sudo apt-get install ruby ruby-dev gcc zlib1g-dev make
     $ sudo gem install git_stats
 
 ## Usage