💚 Stop testing against active_support v2

Author: pboling

.github/workflows/rails-unsupported.yml

@@ -37,7 +37,6 @@ jobs:
         bundler:
           - latest
         gemfile:
-          - a2
           - a3
           - a4
           - a5

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 * Made a new option `body_hash_enabled` which defaults to true to maintain backward compatibility with prior releases. Setting to `false` disables generation of a `oauth_body_hash` component as part of the signature computation.
 * Improved documentation of support policy
+* Stop testing against active_support v2
 
 ### Removed
 * Ruby 2.0, 2.1, 2.2, and 2.3 are no longer valid install targets

gemfiles/README.md

@@ -23,7 +23,6 @@ In the naming of gemfiles, we will use the below shorthand for actionpack and ve
 
 | Gem        | Version | Gemfile    |
 |------------|---------|------------|
-| actionpack | ~> 2.0  | a2.gemfile |
 | actionpack | ~> 3.0  | a3.gemfile |
 | actionpack | ~> 4.0  | a4.gemfile |
 | actionpack | ~> 5.0  | a5.gemfile |