Drop support for Ruby 2.4

It reached EOL on March 31, 2020, and no longer receives patches.

See https://www.ruby-lang.org/en/news/2020/04/05/support-of-ruby-2-4-has-ended/

.rubocop.yml

@@ -10,7 +10,7 @@ AllCops:
     - 'lib/yaml/*'
     - 'lib/**/*.sh'
   DisplayCopNames: true
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5
 
 # Preferred codebase style ---------------------------------------------
 

.travis.yml

@@ -9,7 +9,6 @@ cache:
   bundler
 
 rvm:
-  - '2.4'
   - '2.5'
   - '2.6'
   - '2.7'

README.md

@@ -117,7 +117,7 @@ Man pages have been added. Checkout `man colorls`.
 
 [(Back to top)](#table-of-contents)
 
-1. Install Ruby (preferably, version > 2.3)
+1. Install Ruby (preferably, version >= 2.5)
 2. Install the patched fonts of powerline nerd-font and/or font-awesome. Have a look at the [Nerd Font README](https://github.com/ryanoasis/nerd-fonts/blob/master/readme.md) for more installation instructions.
 
     *Note for `iTerm2` users - Please enable the Nerd Font at iTerm2 > Preferences > Profiles > Text > Non-ASCII font > Hack Regular Nerd Font Complete.*

colorls.gemspec

@@ -45,7 +45,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = 'https://github.com/athityakumar/colorls'
   spec.license       = 'MIT'
 
-  spec.required_ruby_version = '>= 2.4.0'
+  spec.required_ruby_version = '>= 2.5.0'
 
   spec.files         = IO.popen(
     %w[git ls-files -z], external_encoding: Encoding::ASCII_8BIT

lib/colorls/flags.rb

@@ -42,7 +42,6 @@ module ColorLS
 
       @args = [Dir.pwd] if @args.empty?
       @args.sort!.each_with_index do |path, i|
-        begin
         next STDERR.puts "\n   Specified path '#{path}' doesn't exist.".colorize(:red) unless File.exist?(path)
 
         puts '' if i.positive?
@@ -52,7 +51,6 @@ module ColorLS
         STDERR.puts "#{path}: #{e}".colorize(:red)
       end
     end
-    end
 
     def options
       list = @parser.top.list + @parser.base.list

lib/colorls/monkeys.rb

@@ -12,16 +12,6 @@ class String
   def uniq
     split('').uniq.join
   end
-
-  unless instance_methods.include? :delete_prefix
-    define_method(:delete_prefix) do |prefix|
-      if start_with? prefix
-        slice(prefix.length..-1)
-      else
-        slice(0..length)
-      end
-    end
-  end
 end
 
 class Hash
@@ -33,7 +23,3 @@ class Hash
     new_hash
   end
 end
-
-class Array
-  define_method(:sum) { inject(:+) } unless instance_methods.include? :sum
-end

man/colorls.1

@@ -1,7 +1,7 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "COLORLS" "1" "July 2019" "colorls 1.2.0" "colorls Manual"
+.TH "COLORLS" "1" "July 2019" "colorls 1.3.3" "colorls Manual"
 .
 .SH "NAME"
 \fBcolorls\fR \- list directory contents with colors and icons