fix: peer dependencies with webpack@5 (#798)

Author: alexander-akait

package.json

@@ -28,7 +28,7 @@
     "index.js"
   ],
   "peerDependencies": {
-    "webpack": "^4.0.0"
+    "webpack": "^4.0.0 || ^5.0.0"
   },
   "dependencies": {
     "memory-fs": "^0.4.1",