Fixing build script

Author: egil

tools/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-    <package id="Cake" version="0.30.0" />
+    <package id="Cake" version="0.35.0" />
     <package id="NUnit.ConsoleRunner" version="3.9.0" />
     <package id="Octokit" version="0.17.0" />
 </packages>