Merge pull request #493 from si458/master

update ws

Author: k8s-ci-robot

package-lock.json

@@ -72,7 +72,7 @@
     "tmp-promise": "^3.0.2",
     "tslib": "^1.9.3",
     "underscore": "^1.9.1",
-    "ws": "^6.1.0"
+    "ws": "^7.3.1"
   },
   "devDependencies": {
     "@types/byline": "^4.2.31",