make the report issue button redirect to the github repo

src/components/Containers.react.js

@@ -112,7 +112,7 @@ var Containers = React.createClass({
     metrics.track('Opened Issue Reporter', {
       from: 'app'
     });
-    shell.openExternal('https://github.com/docker/kitematic/issues/new');
+    shell.openExternal('https://github.com/docker/kitematic');
   },
 
   render: function () {