Merge pull request #766 from Financial-Times/x-engine-allow-webpack-5

fix: give webpack >=4 support to x-engine

packages/x-engine/package.json

@@ -21,15 +21,14 @@
   "publishConfig": {
     "access": "public"
   },
-
   "volta": {
     "extends": "../../package.json"
   },
   "devDependencies": {
     "check-engine": "^1.10.1"
   },
   "peerDependencies": {
-    "webpack": "4.x"
+    "webpack": ">=4.0.0"
   },
   "dependencies": {
     "assign-deep": "^1.0.1"