Appraisals in closure_tree-6.5.0 vs Appraisals in closure_tree-6.6.0

@@ -1,20 +1,15 @@
 
 appraise 'activerecord-4.2' do
   gem 'activerecord', '~> 4.2.0'
-
-  platforms :ruby, :rbx do
-    gem 'mysql2', '~> 0.3.20'
-  end
 end
 
-appraise 'activerecord-5.0-foreigner' do
+appraise 'activerecord-5.0' do
   gem 'activerecord', '~> 5.0.0'
-  gem 'foreigner'
 end
 
-appraise 'activerecord-5.0' do
-  gem 'activerecord', '~> 5.0.0'
+appraise 'activerecord-5.1' do
+  gem 'activerecord', '~> 5.1.0'
 end
 
 appraise 'activerecord-edge' do
   gem 'activerecord', github: 'rails/rails'
   gem 'arel', github: 'rails/arel'