chore: point towards the master branch for the CI badge

Reference: https://docs.github.com/en/actions/managing-workflow-runs/adding-a-workflow-status-badge#using-the-branch-parameter
socketio · Feb 2, 2021 · ae840fa · ae840fa
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diff --git a/README.md b/README.md
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 # Engine.IO: the realtime engine
 
-[![Build Status](https://github.com/socketio/engine.io/workflows/CI/badge.svg)](https://github.com/socketio/engine.io/actions)
+[![Build Status](https://github.com/socketio/engine.io/workflows/CI/badge.svg?branch=master))](https://github.com/socketio/engine.io/actions)
 [![NPM version](https://badge.fury.io/js/engine.io.svg)](http://badge.fury.io/js/engine.io)
 
 `Engine.IO` is the implementation of transport-based