Actually test rails 5.2, fix version check on route helper

Author: rmosolgo

.travis.yml

@@ -29,6 +29,7 @@ gemfile:
   - gemfiles/rails_4.2.gemfile
   - gemfiles/rails_5.0.gemfile
   - gemfiles/rails_5.1.gemfile
+  - gemfiles/rails_5.2.gemfile
 
 
 matrix:
@@ -64,3 +65,9 @@ matrix:
     gemfile: gemfiles/rails_4.1.gemfile
   - rvm: 2.4.3
     gemfile: gemfiles/rails_4.2.gemfile
+  - rvm: 2.2.8
+    gemfile: gemfiles/rails_5.0.gemfile
+  - rvm: 2.2.8
+    gemfile: gemfiles/rails_5.1.gemfile
+  - rvm: 2.2.8
+    gemfile: gemfiles/rails_5.2.gemfile

lib/generators/graphql/install_generator.rb

@@ -109,7 +109,7 @@ def create_folder_structure
           log :route, 'graphiql-rails'
           shell.mute do
             # Rails 5.2 has better support for `route`?
-            if Rails::VERSION::STRING > "5"
+            if Rails::VERSION::STRING > "5.2"
               route <<-RUBY
 if Rails.env.development?
   mount GraphiQL::Rails::Engine, at: "/graphiql", graphql_path: "/graphql"