(chore): update prettier to 1.19.1

package.json

@@ -81,7 +81,7 @@
     "karma-jasmine": "~1.1.2",
     "karma-jasmine-html-reporter": "^0.2.2",
     "karma-mocha-reporter": "^2.2.5",
-    "prettier": "1.18.2",
+    "prettier": "^1.19.1",
     "pretty-quick": "^1.11.1",
     "protractor": "~5.4.2",
     "ts-node": "~7.0.0",