GETTING_STARTED.md in recurly-3.8.0 vs GETTING_STARTED.md in recurly-3.9.0

@@ -3,10 +3,10 @@
 # Installing
 
 In your Gemfile, add `recurly` as a dependency.
 
 ```ruby
-gem 'recurly', '~> 3.8'
+gem 'recurly', '~> 3.9'
 ```
 
 > *Note*: We try to follow [semantic versioning](https://semver.org/) and will only apply breaking changes to major versions.
 
 # Creating a client