Add logger dependency to fix warning on Ruby 3.4 (#199)

* Add logger dependency to fix warning on Ruby 3.4

Fixes the following warning:

> lib/childprocess.rb:7: warning: logger was loaded from the standard library, but will no longer be part of the default gems since Ruby 3.5.0. Add logger to your Gemfile or gemspec.

* Add Ruby head to CI matrix

* Pin term-ansicolor gem so CI works on Ruby 2.4

* Fix incorrect rubygems source URL

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
-        ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', jruby, truffleruby ]
+        ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', head, jruby, truffleruby ]
         # CRuby < 2.6 does not support macos-arm64, so test those on amd64 instead
         # JRuby 9.4.7.0 does not have native console support on macos-arm64: https://github.com/jruby/jruby/issues/8271
         include:

Gemfile

@@ -1,7 +1,10 @@
-source 'http://rubygems.org'
+source 'https://rubygems.org'
 
 # Specify your gem's dependencies in child_process.gemspec
 gemspec
 
 # Used for local development/testing only
 gem 'rake'
+
+# Newer versions of term-ansicolor (used by coveralls) do not work on Ruby 2.4
+gem 'term-ansicolor', '< 1.8.0' if Gem::Version.new(RUBY_VERSION) < Gem::Version.new('2.5')

childprocess.gemspec

@@ -20,6 +20,8 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = '>= 2.4.0'
 
+  s.add_dependency "logger", "~> 1.5"
+
   s.add_development_dependency "rspec", "~> 3.0"
   s.add_development_dependency "yard", "~> 0.0"
   s.add_development_dependency 'coveralls', '< 1.0'