Mark html-webpack-plugin as supported

Author: sluukkonen

package.json

@@ -58,7 +58,7 @@
     "webpack": "^4.11.1"
   },
   "peerDependencies": {
-    "html-webpack-plugin": "^3.0.0"
+    "html-webpack-plugin": "^3.0.0 || ^4.0.0"
   },
   "dependencies": {
     "lodash": "^4.17.15"