Bump engine.io-client from 0.5.0 to 3.4.0

Bumps [engine.io-client](https://github.com/socketio/engine.io-client) from 0.5.0 to 3.4.0.
- [Release notes](https://github.com/socketio/engine.io-client/releases)
- [Commits](socketio/engine.io-client@0.5.0...3.4.0)

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

Author: dependabot[bot]

package.json

@@ -22,7 +22,7 @@
         "smith": "~0.1.17",
         "msgpack-js-browser": "~0.1.3",
         "engine.io": "0.5.0",
-        "engine.io-client": "0.5.0"
+        "engine.io-client": "3.4.0"
     },
     "scripts": {
         "test": "node test/all.js"