diff --git a/CHANGELOG.md b/CHANGELOG.md
index 850b765..2ae1da9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ Changelog
 master
 ---
 
+2.2.0
+---
+
+- also inspect `.rake` files
+- readme format changes
 
 2.1.0
 ---
diff --git a/Gemfile b/Gemfile
index 851fabc..5f10ba8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 gemspec
diff --git a/LICENSE b/LICENSE
index 1a3a66e..9597938 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018 runtastic GmbH
+Copyright (c) 2019 runtastic GmbH
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
diff --git a/Rakefile b/Rakefile
index 9735cf2..ec64a26 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bundler/gem_tasks'
 
 begin
diff --git a/bin/console b/bin/console
index 0836186..02903bd 100755
--- a/bin/console
+++ b/bin/console
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'bundler/setup'
 require 'rubocop_runner'
diff --git a/lib/rubocop_runner.rb b/lib/rubocop_runner.rb
index 0fd1af9..e7fcf7f 100644
--- a/lib/rubocop_runner.rb
+++ b/lib/rubocop_runner.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rubocop_runner/version'
 require 'rubocop'
 
@@ -7,6 +9,7 @@ module RubocopRunner
   # from https://github.com/djberg96/ptools/blob/master/lib/ptools.rb#L90
   def binary?(file)
     return true if File.ftype(file) != 'file'
+
     s = (File.read(file, File.stat(file).blksize) || '').split(//)
     ((s.size - s.grep(' '..'~').size) / s.size.to_f) > 0.30
   end
@@ -42,8 +45,8 @@ def files
     end
   end
 
-  RUBY_PATTERN = /\.(rb|gemspec|rake)$/
-  RUBY_NAMES = %w(Guardfile Gemfile Rakefile config.ru).freeze
+  RUBY_PATTERN = /\.(rb|gemspec|rake)$/.freeze
+  RUBY_NAMES = %w[Guardfile Gemfile Rakefile config.ru].freeze
 
   def ruby_file?(filename)
     RUBY_NAMES.include?(filename) || !(filename =~ RUBY_PATTERN).nil?
@@ -55,12 +58,13 @@ def staged_ruby_files
     end
   end
 
-  DEFAULT_ARGS = %w(--auto-correct
+  DEFAULT_ARGS = %w[--auto-correct
                     --format fuubar
                     --force-exclusion
-                    --fail-level autocorrect).freeze
+                    --fail-level autocorrect].freeze
   def run
     return 0 if staged_ruby_files.empty?
+
     ::RuboCop::CLI.new.run(DEFAULT_ARGS + staged_ruby_files)
   end
 
@@ -73,6 +77,7 @@ def root
 
   def create_backup(pre_commit_path)
     return unless File.exist?(pre_commit_path)
+
     FileUtils.mv(pre_commit_path,
                  pre_commit_path.join('.bkp'),
                  force: true)
@@ -82,6 +87,7 @@ def install(root = '.')
     require 'fileutils'
     git_root = Pathname.new "#{root}/.git"
     return false unless File.exist?(git_root)
+
     pre_commit_path = git_root.join('hooks', 'pre-commit')
     create_backup(pre_commit_path)
 
diff --git a/lib/rubocop_runner/version.rb b/lib/rubocop_runner/version.rb
index 73cace5..619c9b3 100644
--- a/lib/rubocop_runner/version.rb
+++ b/lib/rubocop_runner/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RubocopRunner
-  VERSION = '2.1.0'.freeze
+  VERSION = '2.2.0'
 end
diff --git a/lib/template/pre-commit b/lib/template/pre-commit
old mode 100644
new mode 100755
index bab8508..2afa20e
--- a/lib/template/pre-commit
+++ b/lib/template/pre-commit
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 begin
   require 'bundler/setup'
diff --git a/rubocop_runner.gemspec b/rubocop_runner.gemspec
index aa62ad3..e684ecd 100644
--- a/rubocop_runner.gemspec
+++ b/rubocop_runner.gemspec
@@ -1,5 +1,6 @@
-# coding: utf-8
-lib = File.expand_path('../lib', __FILE__)
+# frozen_string_literal: true
+
+lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'rubocop_runner/version'
 
@@ -22,9 +23,9 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '~> 1.10'
+  spec.add_development_dependency 'bundler', '> 1.10', '<3'
   spec.add_development_dependency 'rake', '~> 10.0'
 
-  spec.add_development_dependency 'rubocop'
   spec.add_development_dependency 'pry'
+  spec.add_development_dependency 'rubocop'
 end