Update dependency prettier to v1.18.2

Author: renovate-bot

package.json

@@ -98,7 +98,7 @@
     "mini-css-extract-plugin": "0.7.0",
     "node-sass": "4.12.0",
     "optimize-css-assets-webpack-plugin": "5.0.1",
-    "prettier": "1.17.1",
+    "prettier": "1.18.2",
     "pretty-quick": "1.11.0",
     "sass-loader": "7.1.0",
     "script-ext-html-webpack-plugin": "2.1.3",