chore(deps): bump ws from 6.2.1 to 7.0.0

Bumps [ws](https://github.com/websockets/ws) from 6.2.1 to 7.0.0.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](https://github.com/websockets/ws/compare/6.2.1...7.0.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

web3.js/package-lock.json

@@ -20859,11 +20859,11 @@
       }
     },
     "ws": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
-      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.0.0.tgz",
+      "integrity": "sha512-cknCal4k0EAOrh1SHHPPWWh4qm93g1IuGGGwBjWkXmCG7LsDtL8w9w+YVfaF+KSVwiHQKDIMsSLBVftKf9d1pg==",
       "requires": {
-        "async-limiter": "~1.0.0"
+        "async-limiter": "^1.0.0"
       }
     },
     "xml-name-validator": {

web3.js/package.json

@@ -79,7 +79,7 @@
     "rpc-websockets": "^4.3.3",
     "superstruct": "^0.6.0",
     "tweetnacl": "^1.0.0",
-    "ws": "^6.1.0"
+    "ws": "^7.0.0"
   },
   "devDependencies": {
     "@babel/core": "^7.3.3",