Drop Ruby 2.6 support

.circleci/config.yml

@@ -35,9 +35,6 @@ workflows:
   build:
     jobs:
       - documentation-checks
-      - rake_default:
-          name: Ruby 2.6
-          image: cimg/ruby:2.6
       - rake_default:
           name: Ruby 2.7
           image: cimg/ruby:2.7
@@ -53,6 +50,3 @@ workflows:
       - rake_default:
           name: Ruby HEAD
           image: rubocophq/circleci-ruby-snapshot:latest # Nightly snapshot build
-      - rake_default:
-          name: JRuby 9.3
-          image: circleci/jruby:9.3

.rubocop.yml

@@ -12,7 +12,7 @@ AllCops:
     - 'vendor/**/*'
     - 'spec/fixtures/**/*'
     - 'tmp/**/*'
-  TargetRubyVersion: 2.6
+  TargetRubyVersion: 2.7
   SuggestExtensions: false
 
 InternalAffairs/NodeMatcherDirective:

changelog/change_drop_ruby_2_6_support.md

@@ -0,0 +1 @@
+* [#353](https://github.com/rubocop/rubocop-performance/pull/353): **(Breaking)** Drop Ruby 2.6 support. ([@koic][])

rubocop-performance.gemspec

@@ -7,7 +7,7 @@ Gem::Specification.new do |s|
   s.name = 'rubocop-performance'
   s.version = RuboCop::Performance::Version::STRING
   s.platform = Gem::Platform::RUBY
-  s.required_ruby_version = '>= 2.6.0'
+  s.required_ruby_version = '>= 2.7.0'
   s.authors = ['Bozhidar Batsov', 'Jonas Arvidsson', 'Yuji Nakayama']
   s.description = <<~DESCRIPTION
     A collection of RuboCop cops to check for performance optimizations

spec/project_spec.rb

@@ -136,9 +136,9 @@
 
       describe 'link to related issue' do
         let(:issues) do
-          entries.map do |entry|
+          entries.filter_map do |entry|
             entry.match(/\[(?<number>[#\d]+)\]\((?<url>[^)]+)\)/)
-          end.compact
+          end
         end
 
         it 'has an issue number prefixed with #' do

tasks/changelog.rb

@@ -1,10 +1,5 @@
 # frozen_string_literal: true
 
-if RUBY_VERSION < '2.6'
-  puts 'Changelog utilities available only for Ruby 2.6+'
-  exit(1)
-end
-
 # Changelog utility
 class Changelog
   ENTRIES_PATH = 'changelog/'