chore(package): update prettier to version 2.0.1

Closes #67

Author: greenkeeper[bot]

package.json

@@ -79,7 +79,7 @@
     "node-sass": "4.11.0",
     "postcss": "7.0.14",
     "postcss-strip-inline-comments": "0.1.5",
-    "prettier": "1.16.4",
+    "prettier": "2.0.1",
     "pump": "3.0.0",
     "raw-loader": "1.0.0",
     "rollup": "0.58.2",