chore(deps): update dependency prettier to v1.15.3

Author: renovate-bot

package-lock.json

@@ -25,7 +25,7 @@
     "istanbul": "0.4.5",
     "lodash": "4.17.11",
     "nyc": "12.0.2",
-    "prettier": "1.15.2",
+    "prettier": "1.15.3",
     "standard-version": "4.4.0"
   },
   "scripts": {