fix: dropping ruby 2.5 support

BREAKING

.github/workflows/master.yml

@@ -7,7 +7,13 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        ruby: [2.5, 2.6, 2.7, jruby, truffleruby]
+        ruby:
+          - "3.0"
+          - "2.7"
+          - "2.6"
+        include:
+          - ruby: "3.0"
+            coverage: "true"
     name: Test with ruby ${{ matrix.ruby }}
     steps:
       - uses: actions/checkout@v2

.github/workflows/pr.yml

@@ -9,7 +9,13 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        ruby: [2.5, 2.6, 2.7, jruby, truffleruby]
+        ruby:
+          - "3.0"
+          - "2.7"
+          - "2.6"
+        include:
+          - ruby: "3.0"
+            coverage: "true"
     name: Test with ruby ${{ matrix.ruby }}
     steps:
       - uses: actions/checkout@v2

.rubocop.yml

@@ -1,7 +1,7 @@
 inherit_from: .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: "2.5.0"
+  TargetRubyVersion: "2.6.0"
   Exclude:
     - 'spec/**/*'
-    - 'test/**/*'
+    - 'test/**/*'

.travis.yml

@@ -1,5 +1,4 @@
 #rvm:
-#  - 2.5
 #  - 2.6.3
 #  - 2.6.5
 #  - 2.7.0

Gemfile.lock

@@ -7,7 +7,7 @@ GIT
 PATH
   remote: .
   specs:
-    mutils (1.1.8)
+    mutils (1.2.0)
       dry-inflector
 
 GEM

mutils.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.bindir = 'exe'
   spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
-  spec.required_ruby_version = '>= 2.5.0'
+  spec.required_ruby_version = '>= 2.6.0'
   spec.required_rubygems_version = '>= 1.8.11'
   spec.add_dependency('dry-inflector')
   spec.add_development_dependency 'bundler', '~> 2.0'