Move to ruby 2.5 as the earliest supported version.

2.4 is nearly two years beyond EOL now.

Closes #484.

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Install and set up ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.4
+        ruby-version: '2.5'
         bundler-cache: true
 
     - name: Rubocop

.github/workflows/tests.yml

@@ -8,12 +8,12 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu]
-        ruby: ['2.4', '2.5', '2.6', '2.7', '3.0', '3.1', head, jruby, jruby-head, truffleruby, truffleruby-head]
+        ruby: ['2.5', '2.6', '2.7', '3.0', '3.1', head, jruby, jruby-head, truffleruby, truffleruby-head]
         include:
           - os: macos
-            ruby: 2.4
+            ruby: '2.5'
           - os: windows
-            ruby: 2.4
+            ruby: '2.5'
     runs-on: ${{ matrix.os }}-latest
     continue-on-error: ${{ endsWith(matrix.ruby, 'head') || matrix.os == 'windows' }}
     steps:

.rubocop.yml

@@ -7,7 +7,7 @@ inherit_from: .rubocop_todo.yml
 # Set this to the minimum supported ruby in the gemspec. Otherwise
 # we get errors if our ruby version doesn't match.
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5
   NewCops: enable
 
 # Allow this in this file because adding the extra lines is pointless.

.simplecov

@@ -17,6 +17,6 @@ SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter.new(
 )
 
 SimpleCov.start do
-  # enable_coverage :branch   <-- Re-enable this when we move to ruby ~> 2.5.
+  enable_coverage :branch
   add_filter ['/test/', '/samples/']
 end

lib/zip/file.rb

@@ -406,7 +406,6 @@ module Zip
     def on_success_replace
       dirname, basename = ::File.split(name)
       ::Dir::Tmpname.create(basename, dirname) do |tmp_filename|
-        begin
         if yield tmp_filename
           ::File.rename(tmp_filename, name)
           ::File.chmod(@file_permissions, name) unless @create
@@ -416,7 +415,6 @@ module Zip
       end
     end
   end
-  end
 end
 
 # Copyright (C) 2002, 2003 Thomas Sondergaard

rubyzip.gemspec

@@ -25,7 +25,7 @@ Gem::Specification.new do |s|
     'wiki_uri'          => 'https://github.com/rubyzip/rubyzip/wiki'
   }
 
-  s.required_ruby_version = '>= 2.4'
+  s.required_ruby_version = '>= 2.5'
 
   s.add_development_dependency 'minitest', '~> 5.4'
   s.add_development_dependency 'rake', '~> 12.3.3'

test/filesystem/file_nonmutating_test.rb

@@ -445,7 +445,7 @@ class FileNonmutatingTest < MiniTest::Test
         '*/foo/**/*.txt'   => ['globTest/foo/bar/baz/foo.txt']
       }.each do |spec, expected_results|
         results = zf.glob(spec)
-        assert(results.all? { |entry| entry.kind_of? ::Zip::Entry })
+        assert(results.all?(::Zip::Entry))
 
         result_strings = results.map(&:to_s)
         missing_matches = expected_results - result_strings