fix: add files field in package.json (##43)

Author: jaywcjlove

package.json

@@ -23,6 +23,10 @@
     "react-dom": ">=16.9.0",
     "@babel/runtime": ">=7.10.0"
   },
+  "files": [
+    "cjs",
+    "esm"
+  ],
   "devDependencies": {
     "@kkt/less-modules": "~7.1.1",
     "@kkt/raw-modules": "~7.1.1",