chore(package): update eslint-config-prettier to version 4.2.0

Closes #12

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "coveralls": "^3.0.2",
     "eslint": "^5.4.0",
-    "eslint-config-prettier": "^3.0.1",
+    "eslint-config-prettier": "^4.2.0",
     "eslint-config-xo": "^0.24.2",
     "eslint-plugin-json": "^1.2.1",
     "eslint-plugin-prettier": "^2.6.2",