fix: accept less v4 as peer dep (#455)

Author: Cangit

package.json

@@ -116,7 +116,7 @@
   "peerDependencies": {
     "@babel/core": "^7.10.2",
     "coffeescript": "^2.5.1",
-    "less": "^3.11.3",
+    "less": "^3.11.3 || ^4.0.0",
     "postcss": "^7 || ^8",
     "postcss-load-config": "^2.1.0 || ^3.0.0",
     "pug": "^3.0.0",