Merge pull request #62 from michalmuskala/patch-1

Use covertool as a project_plugin, rather than plugin

rebar.config

@@ -53,6 +53,6 @@
   {test,
    [
     {erl_opts, [debug_info]},
-    {plugins, [covertool]}
+    {project_plugins, [covertool]}
    ]}
  ]}.