add 'falsey' library to dependency list and inject it into utils object

So that isTruthy and isFalsey stop complaining about it

Author: DenSpirit

lib/utils/utils.js

@@ -18,6 +18,7 @@ require('kind-of', 'typeOf');
 // matching utils
 require('is-glob');
 require('micromatch', 'mm');
+require('falsey');
 
 // Number utils
 require('is-even');

package.json

@@ -72,6 +72,7 @@
     "array-sort": "^0.1.2",
     "create-frame": "^1.0.0",
     "define-property": "^1.0.0",
+    "falsey": "^0.3.0",
     "for-in": "^1.0.2",
     "for-own": "^1.0.0",
     "get-object": "^0.2.0",