An in-range update of socket.io is breaking the build 🚨

## The dependency [socket.io](https://github.com/socketio/socket.io) was updated from `2.2.0` to `2.3.0`.

🚨 [View failing branch](https://github.com/aethant/merino/compare/master...aethant:greenkeeper%2Fsocket.io-2.3.0).

This version is **covered** by your **current version range** and after updating it in your project **the build failed**.

socket.io is a direct dependency of this project, and **it is very likely causing it to break**. If other packages depend on yours, this update is probably also breaking those in turn.

Status Details

- ❌ **continuous-integration/travis-ci/push:** The Travis CI build failed ([Details](https://travis-ci.org/aethant/merino/builds/587415764?utm_source=github_status&utm_medium=notification)).

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