chore: update prettier configuration

package.json

@@ -96,6 +96,7 @@
     "mocha": "7.2.0",
     "ng-mocks": "11.5.0",
     "npm-run-all": "4.1.5",
+    "prettier": "2.3.0",
     "rxjs": "6.6.3",
     "semantic-release": "17.2.3",
     "spectron": "12.0.0",
@@ -150,4 +151,4 @@
       "lcov"
     ]
   }
-}
+}