Drop support for Ruby 2.2

It reached EOL on 20th Jun 2018 and no longer receives patches.

* set required Ruby version to >= 2.3 in spec file
* set rubocop's TargetRubyVersion to 2.3 and fix all the offenses

.rubocop.yml

@@ -8,7 +8,7 @@ AllCops:
     - 'lib/yaml/*'
     - 'lib/**/*.sh'
   DisplayCopNames: true
-  TargetRubyVersion: 2.2
+  TargetRubyVersion: 2.3
 
 # Preferred codebase style ---------------------------------------------
 

.travis.yml

@@ -9,7 +9,6 @@ cache:
   bundler
 
 rvm:
-  - '2.2'
   - '2.3'
   - '2.4'
   - '2.5'

colorls.gemspec

@@ -33,7 +33,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = 'https://github.com/athityakumar/colorls'
   spec.license       = 'MIT'
 
-  spec.required_ruby_version = '>= 2.2.0'
+  spec.required_ruby_version = '>= 2.3.0'
 
   spec.files         = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(test|spec|features)/})

exe/colorls

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'colorls'
 

lib/colorls.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'yaml'
 require 'etc'
 require 'English'

lib/colorls/core.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ColorLS
   class Core
     def initialize(input, all: false, report: false, sort: false, show: false,

lib/colorls/fileinfo.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module ColorLS

lib/colorls/flags.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'optparse'
 require 'colorls/version'
 require 'ostruct'
@@ -42,7 +44,7 @@ module ColorLS
         begin
           next STDERR.puts "\n   Specified path '#{path}' doesn't exist.".colorize(:red) unless File.exist?(path)
 
-          puts '' if i > 0
+          puts '' if i.positive?
           puts "\n#{path}:" if Dir.exist?(path) && @args.size > 1
           Core.new(path, @opts).ls
         rescue SystemCallError => e

lib/colorls/git.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ColorLS
   module Git
     def self.status(repo_path)

lib/colorls/monkeys.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class String
   def colorize(color)
     self.color(color.to_sym)

lib/colorls/version.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ColorLS
-  VERSION = '1.1.1'.freeze
+  VERSION = '1.1.1'
 end

lib/colorls/yaml.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ColorLS
   class Yaml
     def initialize(filename)