fix(package): update mkdirp to version 1.0.2

Closes #39

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
   "dependencies": {
     "chalk": "^2.0.0",
     "gulp-git": "^1.6.0",
-    "mkdirp": "^0.5.1",
+    "mkdirp": "^1.0.2",
     "string": "^3.3.1",
     "yeoman-generator": "^1.0.0",
     "yosay": "^1.0.5"