changed literal array syntax, as suggested by RuboCop

spec/factories/file_type.rb

@@ -181,7 +181,7 @@ FactoryGirl.define do
     singleton_file_type
   end
 
-  %w[binary executable renderable].each do |attribute|
+  %w(binary executable renderable).each do |attribute|
     trait(attribute) do
       self.send(attribute, true)
     end

spec/factories/shared_traits.rb

@@ -1,5 +1,5 @@
 FactoryGirl.define do
-  %w[admin external_user teacher].each do |factory_name|
+  %w(admin external_user teacher).each do |factory_name|
     trait :"created_by_#{factory_name}" do
       association :user, factory: factory_name
     end