Drop support for ruby 2.5

Ruby 2.5 reached EoL on 2021-03-31.

.github/ISSUE_TEMPLATE/bug-report.md

@@ -32,11 +32,11 @@ require "bundler/inline"
 
 # STEP ONE: What versions are you using?
 gemfile(true) do
-  ruby "2.5.1"
+  ruby "3.0.2"
   source "https://rubygems.org"
-  gem "activerecord", "5.2.0"
+  gem "activerecord", "6.1.4.1"
   gem "minitest", "5.11.3"
-  gem "paper_trail", "9.2.0", require: false
+  gem "paper_trail", "12.1.0", require: false
   gem "sqlite3", "1.3.13"
 end
 

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           # See "Lowest supported ruby version" in CONTRIBUTING.md
-          ruby-version: '2.5'
+          ruby-version: '2.6'
       - name: Bundle
         run: |
           gem install bundler
@@ -63,7 +63,7 @@ jobs:
         # in case it still produces any deprecation warnings.
         #
         # See "Lowest supported ruby version" in CONTRIBUTING.md
-        ruby: [ '2.5', '2.7', '3.0' ]
+        ruby: [ '2.6', '2.7', '3.0' ]
 
         exclude:
           # rails 5.2 requires ruby < 3.0

.rubocop.yml

@@ -22,7 +22,7 @@ AllCops:
   NewCops: enable
 
   # See "Lowest supported ruby version" in CONTRIBUTING.md
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.6
 
 Bundler/OrderedGems:
   Exclude:

CHANGELOG.md

@@ -15,8 +15,13 @@ recommendations of [keepachangelog.com](http://keepachangelog.com/).
 
 ### Fixed
 
+- None
+
+### Dependencies
+
 - [#1338](https://github.com/paper-trail-gem/paper_trail/pull/1338) -
   Support Psych version 4
+- ruby >= 2.6 (was >= 2.5). Ruby 2.5 reached EoL on 2021-03-31.
 
 ## 12.1.0 (2021-08-30)
 

lib/paper_trail/compatibility.rb

@@ -8,7 +8,7 @@ module PaperTrail
   #
   # It is not safe to assume that a new version of rails will be compatible with
   # PaperTrail. PT is only compatible with the versions of rails that it is
-  # tested against. See `.travis.yml`.
+  # tested against. See `.github/workflows/test.yml`.
   #
   # However, as of
   # [#1213](https://github.com/paper-trail-gem/paper_trail/pull/1213) our

paper_trail.gemspec

@@ -43,9 +43,7 @@ has been destroyed.
   # about 3 years, per https://www.ruby-lang.org/en/downloads/branches/
   #
   # See "Lowest supported ruby version" in CONTRIBUTING.md
-  #
-  # Ruby 2.5 reaches EoL on 2021-03-31.
-  s.required_ruby_version = ">= 2.5.0"
+  s.required_ruby_version = ">= 2.6.0"
 
   # We no longer specify a maximum activerecord version.
   # See discussion in paper_trail/compatibility.rb