Update dependency prettier to v1.14.0 (#19)

Author: renovate[bot]

package-lock.json

@@ -34,7 +34,7 @@
     "ava": "1.0.0-beta.6",
     "husky": "1.0.0-rc.13",
     "lint-staged": "7.2.0",
-    "prettier": "1.13.7",
+    "prettier": "1.14.0",
     "rimraf": "2.6.2",
     "rollup": "0.62.0",
     "rollup-plugin-commonjs": "9.1.3",