fix(package): update mkdirp to version 1.0.3

Closes #56

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "deepmerge": "^4.0.0",
     "js-yaml": "^3.9.0",
     "log4js": "^6.0.0",
-    "mkdirp": "^0.5.1",
+    "mkdirp": "^1.0.3",
     "mustache": "^4.0.0",
     "path-is-inside": "^1.0.2",
     "urijs": "^1.18.10",