fix: fix modules in package.json

Author: woothu

package.json

@@ -18,7 +18,7 @@
   "homepage": "https://coreui.io",
   "main": "lib/index.js",
   "types": "src/index.d.ts",
-  "module": "src/index.js",
+  "module": "es/index.js",
   "files": [
     "css/",
     "es/",