(maint) - Update gems to DevX guidelines

Author: jordanbreen28

Gemfile

@@ -1,33 +1,22 @@
-source ENV['GEM_SOURCE'] || 'https://rubygems.org'
+source 'https://rubygems.org'
 
-# Specify your gem's dependencies in pdk.gemspec
 gemspec
 
-group :development do
-  gem 'rspec', '>= 3.2', :require => false
-  gem 'pry'
-  if RUBY_VERSION =~ /^2\.1\./
-    gem "rubocop", "<= 0.57.2", :require => false, :platforms => [:ruby, :x64_mingw]
-    gem 'rake', '~> 12.3',      :require => false
-  else
-    gem "rubocop", "~> 0.80", :require => false, :platforms => [:ruby, :x64_mingw]
-    gem 'rake', '>= 10.4',      :require => false
-  end
+group :test do
+  gem 'rake'
+  gem 'rspec', '~> 3.1'
+  gem 'rspec-collection_matchers', '~> 1.0'
+  gem 'rspec-its', '~> 1.0'
 
-  gem "yard",          :require => false
-  gem 'redcarpet',     :require => false
-  gem 'github-markup', :require => false
-end
+  gem 'rubocop', '~> 1.48.1'
+  gem 'rubocop-rspec', '~> 2.19'
+  gem 'rubocop-performance', '~> 1.16'
 
-# Evaluate Gemfile.local and ~/.gemfile if they exist
-extra_gemfiles = [
-  "#{__FILE__}.local",
-  File.join(Dir.home, '.gemfile'),
-]
+  gem 'codecov'
+  gem 'simplecov'
+end
 
-extra_gemfiles.each do |gemfile|
-  if File.file?(gemfile) && File.readable?(gemfile)
-    eval(File.read(gemfile), binding)
-  end
+group :development do
+  gem 'pry'
+  gem 'yard'
 end
-# vim: syntax=ruby