chore(package): update mkdirp to version 1.0.2

Closes #24

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
     "q": "^1.1.2"
   },
   "devDependencies": {
-    "mkdirp": "^0.5.0",
+    "mkdirp": "^1.0.2",
     "rimraf": "^2.2.8",
     "semantic-release": "^6.3.2",
     "standard": "^10.0.1",