Bump subscriptions-transport-ws from 0.9.19 to 0.11.0 (#7429)

Bumps [subscriptions-transport-ws](https://github.com/apollostack/subscriptions-transport-ws) from 0.9.19 to 0.11.0.
- [Release notes](https://github.com/apollostack/subscriptions-transport-ws/releases)
- [Changelog](https://github.com/apollographql/subscriptions-transport-ws/blob/master/CHANGELOG.md)
- [Commits](apollographql/subscriptions-transport-ws@v0.9.19...v0.11.0)

---
updated-dependencies:
- dependency-name: subscriptions-transport-ws
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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package.json

@@ -101,7 +101,7 @@
     "pdfjs-dist": "2.5.207",
     "raphael": "2.3.0",
     "rxjs": "^6.6.3",
-    "subscriptions-transport-ws": "^0.9.19",
+    "subscriptions-transport-ws": "^0.11.0",
     "tslib": "^2.3.0",
     "zone.js": "~0.10.2"
   },