chore(deps): update dependency mkdirp to v1

Author: renovate-bot

package.json

@@ -128,7 +128,7 @@
     "merge2": "^1.2.1",
     "mini-css-extract-plugin": "^0.9.0",
     "minimist": "^1.2.0",
-    "mkdirp": "^0.5.1",
+    "mkdirp": "^1.0.0",
     "mockdate": "^2.0.2",
     "nprogress": "^0.2.0",
     "optimize-css-assets-webpack-plugin": "^5.0.1",