Merge pull request #6 from uiwjs/renovate/less-4.x

chore(deps): update dependency less to v4

Author: jaywcjlove

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "bannerjs": "1.0.7",
     "csso-cli": "3.0.0",
-    "less": "3.13.1"
+    "less": "4.1.1"
   },
   "license": "MIT"
 }