Add Ruby 3.1 to CI (#558)

* Add Ruby 3.1 to CI

Update Rubocop for recent Rubies
Disable Rubocop run for Rubies before Ruby 2.4
Quote '3.0' in the CI configuration to ensure it loads a 3.0.x Ruby
Set RUBYOPT="--disable_error_highlight" so Ruby 3.1 error matchers pass

* Add CHANGELOG.md entry

* Re-add deleted line from CHANGELOG.md

* Set minimum supported Ruby version to 2.4.

Remove a number of code bits designed to support Rubies below version 2.4

* Bump version.  Remove unneeded require from Gemfile.  Add require to spec/support file

1 files changed, 8 insertions, 1 deletions

diff --git a/spec/support/integration_specs.rb b/spec/support/integration_specs.rb
index ea0da53..431167d 100644
--- a/spec/support/integration_specs.rb
+++ b/spec/support/integration_specs.rb
@@ -1,10 +1,17 @@
+require File.expand_path('../../../lib/hashie/extensions/ruby_version', __FILE__)
+
 # Generates the bundle command for running an integration test
 #
 # @param [String] integration the integration folder to run
 # @param [String] command the command to run
 # @return [String]
 def integration_command(integration, command)
-  "#{integration_gemfile(integration)} #{command}"
+  if Hashie::Extensions::RubyVersion.new(RUBY_VERSION) >=
+     Hashie::Extensions::RubyVersion.new('3.1.0')
+     ruby_opts = "RUBYOPT=--disable-error_highlight "
+  end
+
+  "#{ruby_opts}#{integration_gemfile(integration)} #{command}"
 end
 
 # Generates the Gemfile for an integration