Drop Ruby 2.5 runtime support

Follow up rubocop/rubocop#10577.

This commit drops Ruby 2.5 runtime support.
And CRuby 2.5 compatible JRuby 9.2 will be dropped and CRuby 2.6 compatible
JRuby 9.3 or higher is required.

.circleci/config.yml

@@ -23,9 +23,6 @@ jobs:
 workflows:
   build:
     jobs:
-      - rake_default:
-          name: Ruby 2.5
-          image: cimg/ruby:2.5
       - rake_default:
           name: Ruby 2.6
           image: cimg/ruby:2.6
@@ -42,5 +39,5 @@ workflows:
           name: Ruby HEAD
           image: rubocophq/circleci-ruby-snapshot:latest # Nightly snapshot build
       - rake_default:
-          name: JRuby 9.2
-          image: circleci/jruby:9.2
+          name: JRuby 9.3
+          image: circleci/jruby:9.3

.rubocop.yml

@@ -8,7 +8,7 @@ require:
 
 AllCops:
   NewCops: enable
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.6
 
 Naming/PredicateName:
   # Method define macros for dynamically generated method.

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ### Changes
 
-* Drop support for Ruby 2.4. ([@koic][])
+* Drop support for Ruby 2.4 and 2.5. ([@koic][])
 
 ## 1.1.0 (2020-06-11)
 

rubocop-faker.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description   = 'A RuboCop extension for Faker.'
   spec.homepage      = 'https://github.com/koic/rubocop-faker'
   spec.license       = 'MIT'
-  spec.required_ruby_version = Gem::Requirement.new('>= 2.5.0')
+  spec.required_ruby_version = Gem::Requirement.new('>= 2.6.0')
 
   spec.metadata = {
     'homepage_uri' => spec.homepage,