Update development and testing dependencies

Gemfile

@@ -11,16 +11,16 @@ group :lint do
 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_cloud do