add a trigger category

out test instance has the trigger categories enable, so this becomes a mandatory field

Author: nogates

spec/live/trigger_spec.rb

@@ -3,6 +3,7 @@
 describe ZendeskAPI::Trigger, :delete_after do
  def valid_attributes
  {
+ :category_id => "3",
  :title => "my test trigger",
  :conditions => {
  :all => [{ :field => "status", :operator => "is", :value => "open" }]