chore(deps): Update dependency prettier to v2 (#43333)

* chore(deps): Update dependency prettier to v2

* fix(prettierrc): Address review comments

.prettierrc.json

@@ -1,5 +1,6 @@
 {
     "$schema": "http://json.schemastore.org/prettierrc",
+    "arrowParens": "avoid",
     "singleQuote": true,
     "trailingComma": "all",
     "tabWidth": 4,

package.json

@@ -24,7 +24,7 @@
     },
     "devDependencies": {
         "dtslint": "latest",
-        "prettier": "^1.17.1",
+        "prettier": "^2.0.2",
         "types-publisher": "github:Microsoft/types-publisher#production"
     },
     "husky": {