chore(deps): bump sockjs from 0.3.19 to 0.3.20

Bumps [sockjs](https://github.com/sockjs/sockjs-node) from 0.3.19 to 0.3.20.
- [Release notes](https://github.com/sockjs/sockjs-node/releases)
- [Changelog](https://github.com/sockjs/sockjs-node/blob/v0.3.20/Changelog)
- [Commits](sockjs/sockjs-node@v0.3.19...v0.3.20)

---
updated-dependencies:
- dependency-name: sockjs
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -46,7 +46,7 @@
     "selfsigned": "^1.9.1",
     "semver": "^5.6.0",
     "serve-index": "^1.7.2",
-    "sockjs": "0.3.19",
+    "sockjs": "0.3.20",
     "sockjs-client": "1.3.0",
     "spdy": "^3.4.1",
     "strip-ansi": "^3.0.0",