Use --harmony flag on node runtime

cshaver · cshaver · commit 8fb8c8f1bfdc · 2016-05-16T02:01:21.000-07:00
diff --git a/bin/css-ast-diff b/bin/css-ast-diff
@@ -1,4 +1,4 @@
-#!/usr/bin/env node
+#!/usr/bin/env node --harmony
 'use strict';
 
 const CLI = require('../lib/cli');
