chore(deps): update dependency ws to v7 (#1834)

Author: renovate[bot]

package-lock.json

@@ -107,7 +107,7 @@
     "url-loader": "^2.0.0",
     "webpack": "^4.33.0",
     "webpack-cli": "^3.3.4",
-    "ws": "^6.2.1"
+    "ws": "^7.0.0"
   },
   "peerDependencies": {
     "webpack": "^4.0.0"