chore(package): update mkdirp to version 1.0.3

Closes #52

Author: greenkeeper[bot]

package.json

@@ -55,7 +55,7 @@
     "grunt-contrib-jshint": "^1.0.0",
     "grunt-mocha-test": "^0.13.2",
     "jshint-path-reporter": "~0.1",
-    "mkdirp": "^0.5.0",
+    "mkdirp": "^1.0.3",
     "mocha": "^4.0.1",
     "mocha-unfunk-reporter": "^0.4.0",
     "touch": "^3.1.0",