Update prettier config

Author: coderitual

package.json

@@ -42,7 +42,8 @@
     ]
   },
   "prettier": {
-    "printWidth": 100
+    "printWidth": 100,
+    "trailingComma": "all"
   },
   "repository": {
     "type": "git",
@@ -54,4 +55,4 @@
   "homepage": "https://github.com/coderitual/react-ui-interactions#readme",
   "author": "coderitual",
   "license": "MIT"
-}
+}