README.md in sidekiq-logstash-1.2.1 vs README.md in sidekiq-logstash-2.0.0

@@ -1,10 +1,10 @@
 # Sidekiq::Logstash
 
-[![Gem Version](https://badge.fury.io/rb/sidekiq-logstash.svg)](https://badge.fury.io/rb/sidekiq-logstash) [<img src="https://travis-ci.org/iMacTia/sidekiq-logstash.svg?branch=master" alt="version" />](https://travis-ci.org/iMacTia/sidekiq-logstash)
+[![Gem Version](https://badge.fury.io/rb/sidekiq-logstash.svg)](https://badge.fury.io/rb/sidekiq-logstash)
+[![GitHub Actions CI](https://github.com/iMacTia/sidekiq-logstash/workflows/CI/badge.svg)](https://github.com/iMacTia/sidekiq-logstash/actions?query=workflow%3ACI)
 
-
 Sidekiq::Logstash turns your [Sidekiq](https://github.com/mperham/sidekiq) log into an organised, aggregated, JSON-syntax log ready to be sent to a logstash server.
 
 ```json
 {
   "class"           : "MyWorker",
@@ -28,13 +28,14 @@
 }
 ```
 
 ## Installation
 
-Add this line to your application's Gemfile:
+Add one of the following lines to your application's Gemfile:
 
 ```ruby
-gem 'sidekiq-logstash'
+gem 'sidekiq-logstash', '~> 2.0' # Sidekiq 6
+gem 'sidekiq-logstash', '< 2' # Sidekiq 5 or older
 ```
 
 And then execute:
 
 ```bash