chore(package): update mkdirp to version 1.0.4

Closes #74

Author: greenkeeper[bot]

package.json

@@ -75,7 +75,7 @@
     "karma-sauce-launcher": "1.1.0",
     "karma-sourcemap-loader": "0.3.7",
     "karma-webpack": "1.8.0",
-    "mkdirp": "0.5.1",
+    "mkdirp": "1.0.4",
     "mocha": "3.2.0",
     "nyc": "10.0.0",
     "phantomjs-prebuilt": "2.1.14",