v4.0.0

Changed

• Moved CI build to GitHub Actions (#52).
• Updated test matrix to test against the following gem versions, any gem versions outside of this matrix are no longer fully supported (#58):
  • faraday: ~> 1.10.0, ~> 2.8.0, ~> 2.9.0 & ~> 2.10.0
  • jwt: ~> 1.5.0, ~> 2.6.0, ~> 2.7.0 & ~> 2.8.0
  • rack: ~> 2.1.0
• Removed support for Ruby 2.4 & 2.5 (#58)
• Add Ruby 3.3 (#56), 3.2 (#55) to our test matrix

Fixed

• Compatibility with Rack 3+ (#58)