Add missing "use strict" directive

Turbo87 · Turbo87 · commit ada5802bb248 · 2017-07-09T17:04:10.000+02:00
diff --git a/index.js b/index.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var walkSync = require('walk-sync');
 var Plugin = require('broccoli-plugin');
 var UglifyJS = require('uglify-js');

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+'use strict';`
	`2`	`+`
`1`	`3`	`var walkSync = require('walk-sync');`
`2`	`4`	`var Plugin = require('broccoli-plugin');`
`3`	`5`	`var UglifyJS = require('uglify-js');`