Update package.json

Author: antialias

package.json

@@ -18,7 +18,6 @@
     "clone": "^1.0.2",
     "concat-stream": "^1.5.2",
     "graceful-fs": "^4.1.6",
-    "mkdirp": "^0.5.0",
     "normalize-package-data": "~1.0.1 || ^2.0.0",
     "npm-package-arg": "^3.0.0 || ^4.0.0 || ^5.0.0",
     "once": "^1.3.3",