README.md in ld-eventsource-2.2.0 vs README.md in ld-eventsource-2.2.1

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 LaunchDarkly SSE Client for Ruby
 ================================
 
-[![Gem Version](https://badge.fury.io/rb/ld-eventsource.svg)](http://badge.fury.io/rb/ld-eventsource) [![Circle CI](https://circleci.com/gh/launchdarkly/ruby-eventsource/tree/master.svg?style=svg)](https://circleci.com/gh/launchdarkly/ruby-eventsource/tree/master)
+[![Gem Version](https://badge.fury.io/rb/ld-eventsource.svg)](http://badge.fury.io/rb/ld-eventsource) [![Circle CI](https://circleci.com/gh/launchdarkly/ruby-eventsource/tree/main.svg?style=svg)](https://circleci.com/gh/launchdarkly/ruby-eventsource/tree/main)
 
 A client for the [Server-Sent Events](https://www.w3.org/TR/eventsource/) protocol. This implementation runs on a worker thread, and uses the [`http`](https://rubygems.org/gems/http) gem to manage a persistent connection. Its primary purpose is to support the [LaunchDarkly SDK for Ruby](https://github.com/launchdarkly/ruby-client), but it can be used independently.
 
 Parts of this code are based on https://github.com/Tonkpils/celluloid-eventsource, but it does not use Celluloid.
 