Merge pull request webtorrent#321 from webtorrent/greenkeeper/ws-7.0.0

Update ws to the latest version 🚀

Author: DiegoRBaquero

package.json

@@ -40,7 +40,7 @@
     "string2compact": "^1.1.1",
     "uniq": "^1.0.1",
     "unordered-array-remove": "^1.0.2",
-    "ws": "^6.0.0"
+    "ws": "^7.0.0"
   },
   "devDependencies": {
     "electron-webrtc": "^0.3.0",