Rakefile in simple-navigation-4.0.5 vs Rakefile in simple-navigation-4.1.0

@@ -13,9 +13,10 @@
 namespace :spec do
   mappers = %w[
     rails-3-2-stable
     rails-4-1-stable
     rails-4-2-stable
+    rails-5-2-stable
   ]
 
   mappers.each do |gemfile|
     desc "Run Tests against #{gemfile}"
     task gemfile do