Add support ruby 2.4 again

By monkey-patching the Hash and String classes

Note that simplecov/simplecov-lcov code needs to be commented out, as this library does not support ruby 2.4

lib/unleash.rb

@@ -7,6 +7,14 @@
 
 Gem.find_files('unleash/strategy/**/*.rb').each{ |path| require path unless path.end_with? '_spec.rb' }
 
+if Gem::Version.new(RUBY_VERSION.split(".")[0..1]&.join(".")) < Gem::Version.new('2.5')
+  # Monkey patch to allow supporting older versions of ruby
+  require 'unleash/core_ext/hash'
+  require 'unleash/core_ext/string'
+  String.include Unleash::CoreExtensions::String
+  Hash.include Unleash::CoreExtensions::Hash
+end
+
 module Unleash
   TIME_RESOLUTION = 3
 

lib/unleash/core_ext/hash.rb

@@ -0,0 +1,13 @@
+module Unleash
+  module CoreExtensions
+    module Hash
+      def transform_keys
+        result = {}
+        each_key do |key|
+          result[yield(key)] = self[key]
+        end
+        result
+      end
+    end
+  end
+end

lib/unleash/core_ext/string.rb

@@ -0,0 +1,10 @@
+module Unleash
+  module CoreExtensions
+    module String
+      def delete_suffix(suffix)
+        return self[0..(self.length - 1 - suffix.length)] if self.end_with?(suffix)
+        self
+      end
+    end
+  end
+end

unleash-client.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
   spec.bindir        = 'bin'
   spec.executables   = spec.files.grep(%r{^bin/unleash}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
-  spec.required_ruby_version = ">= 2.5"
+  spec.required_ruby_version = ">= 2.4"
 
   spec.add_dependency "murmurhash3", "~> 0.1.6"