Update dependency prettier to v1.18.0

Author: renovate-bot

package.json

@@ -34,7 +34,7 @@
     "@types/iconv-lite": "0.0.1",
     "@types/jest": "24.0.13",
     "jest": "24.7.1",
-    "prettier": "1.17.1",
+    "prettier": "1.18.0",
     "ts-jest": "24.0.2",
     "typescript": "3.5.1"
   },