Update testing deps

Gemfile

@@ -1,22 +1,26 @@
 source 'https://rubygems.org'
 
-group :lint do
-  gem 'foodcritic', '~> 4.0'
-  gem 'rubocop', '~> 0.33'
+group :rake do
   gem 'rake'
+  gem 'tomlrb'
+end
+
+group :lint do
+  gem 'foodcritic', '~> 5.0'
+  gem 'rubocop', '~> 0.34'
 end
 
 group :unit do
-  gem 'berkshelf',  '~> 3.2'
-  gem 'chefspec',   '~> 4.3'
+  gem 'berkshelf',  '~> 4.0'
+  gem 'chefspec',   '~> 4.4'
 end
 
 group :kitchen_common do
   gem 'test-kitchen', '~> 1.4'
 end
 
 group :kitchen_vagrant do
-  gem 'kitchen-vagrant', '~> 0.18'
+  gem 'kitchen-vagrant', '~> 0.19'
 end
 
 group :kitchen_pester do