Update dependency mkdirp to v1

Author: renovate-bot

package.json

@@ -16,7 +16,7 @@
     "highland": "2.13.4",
     "html-minifier": "4.0.0",
     "minimalcss": "0.8.2",
-    "mkdirp": "0.5.1",
+    "mkdirp": "1.0.3",
     "puppeteer": "^1.8.0",
     "serve-static": "1.14.1",
     "sourcemapped-stacktrace-node": "2.1.8"

yarn.lock

@@ -2588,6 +2588,10 @@ [email protected], mkdirp@^0.5.0, mkdirp@^0.5.1:
   dependencies:
     minimist "0.0.8"
 
+[email protected]:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-1.0.3.tgz#4cf2e30ad45959dddea53ad97d518b6c8205e1ea"
+
 [email protected]:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"