[pkg] Update ws to version 7.1.0 (#78)

package.json

@@ -38,6 +38,6 @@
     "mocha": "~6.1.0",
     "pre-commit": "~1.2.0",
     "primus": "~7.3.0",
-    "ws": "~7.0.0"
+    "ws": "~7.1.0"
   }
 }