chore(package): update mkdirp to version 1.0.3

Closes #221

Author: greenkeeper[bot]

package.json

@@ -109,7 +109,7 @@
     "karma-webpack": "2.0.5",
     "leakage": "0.3.0",
     "loadtest": "2.3.0",
-    "mkdirp": "0.5.1",
+    "mkdirp": "1.0.3",
     "mocha": "4.0.1",
     "np": "2.16.1",
     "npm-run-all": "4.1.1",