Update rubocop dependency to >= 0.23

.rspec

@@ -1,2 +1 @@
 --color
---format=doc

.rubocop.yml

@@ -1,5 +1,5 @@
 AllCops:
-  Includes:
+  Include:
     - 'Gemfile'
     - 'Rakefile'
     - 'mlb.gemspec'

Gemfile

@@ -18,7 +18,7 @@ group :test do
   gem 'coveralls', :require => false
   gem 'mime-types', '~> 1.25', :platforms => [:jruby, :ruby_18]
   gem 'rspec', '>= 2.14'
-  gem 'rubocop', '>= 0.19', :platforms => [:ruby_19, :ruby_20, :ruby_21]
+  gem 'rubocop', '>= 0.23', :platforms => [:ruby_19, :ruby_20, :ruby_21]
   gem 'simplecov', :require => false
   gem 'webmock'
   gem 'yardstick'

Rakefile

@@ -25,10 +25,10 @@ end
 
 begin
   require 'rubocop/rake_task'
-  Rubocop::RakeTask.new
+  RuboCop::RakeTask.new
 rescue LoadError
   task :rubocop do
-    $stderr.puts 'Rubocop is disabled'
+    $stderr.puts 'RuboCop is disabled'
   end
 end
 
@@ -42,7 +42,7 @@ end
 
 require 'yardstick/rake/verify'
 Yardstick::Rake::Verify.new do |verify|
-  verify.threshold = 56.2
+  verify.threshold = 56.5
 end
 
 task :default => [:spec, :rubocop, :verify_measurements]

lib/mlb/request.rb

@@ -11,8 +11,6 @@ module MLB
       end.body
     end
 
-  private
-
     def self.connection
       Faraday.new(:url => 'https://www.googleapis.com', :ssl => {:verify => false}) do |builder|
         builder.request :url_encoded