add keywords

Author: newraina

package.json

@@ -5,6 +5,7 @@
   "typing": "lib/index.d.ts",
   "repository": "[email protected]:antdex/react-json-tree.git",
   "author": "newraina <[email protected]>",
+  "keywords": ["react", "component", "antd", "json view", "tree view"],
   "license": "MIT",
   "scripts": {
     "start": "parcel example/index.html --open",