Add FactoryBot/ConsistentParenthesesStyle rule

This rule was added in rubocop-rspec 2.14.0. We were already applying it
most of the time.

spec/models/notification_spec.rb

@@ -39,8 +39,8 @@ describe Notification do
 
     describe "#recent" do
       it "returns notifications sorted by id descendant" do
-        old_notification = create :notification
-        new_notification = create :notification
+        old_notification = create(:notification)
+        new_notification = create(:notification)
 
         expect(Notification.recent).to eq [new_notification, old_notification]
       end
@@ -80,8 +80,8 @@ describe Notification do
 
   describe "#timestamp" do
     it "returns the timestamp of the trackable object" do
-      comment = create :comment
-      notification = create :notification, notifiable: comment
+      comment = create(:comment)
+      notification = create(:notification, notifiable: comment)
 
       expect(notification.timestamp).to eq comment.created_at
     end