chore(package): update mkdirp to version 1.0.3

Closes #60

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "jsdom": "^9.8.3",
     "jsx-chai": "^4.0.0",
     "mime": "^1.3.4",
-    "mkdirp": "^0.5.1",
+    "mkdirp": "^1.0.3",
     "mocha": "^3.2.0",
     "mocha-clean": "^1.0.0",
     "react-addons-test-utils": "^15.4.1",