bump prettier to 1.19.1

Author: AbhiPrasad

package.json

@@ -65,7 +65,7 @@
     "madge": "4.0.2",
     "mocha": "^6.1.4",
     "npm-run-all": "^4.1.2",
-    "prettier": "1.19.0",
+    "prettier": "1.19.1",
     "replace-in-file": "^4.0.0",
     "rimraf": "^2.6.3",
     "sinon": "^7.3.2",