perf: uninstall classnames & install clsx (#16)

Author: li-jia-nan

package.json

@@ -42,8 +42,7 @@
     "watch": "father dev"
   },
   "dependencies": {
-    "@rc-component/util": "^1.2.0",
-    "classnames": "^2.3.2"
+    "@rc-component/util": "^1.2.0"
   },
   "devDependencies": {
     "@rc-component/father-plugin": "^2.0.2",