anchor.diff:  
   ## Presenter
   
  -+ id: `somepresenterid` (string) - ID of Presenter
  ++ id: 12345 (number) - ID of Presenter
   + name: `John Doe` (string) - Presenter's name
   + email: `jdoe@mail.com` (string) - Presenter's email
   + phone_number: `+62819123123` (string) - Presenter's phone number
  
positive.code: + description: `here is class description` (string) - description of class
  
  
  ## Error (object)
  
  + message: This is an error (string)
  
negative.code: 
  ## Facilitator
  
  + id: 12345 (number) - ID of Facilitator
  + name: `John Doe` (string) - Facilitator's name
  + email: `jdoe@mail.com` (string) - Facilitator's email
  + phone_number: `+62819123123` (string) - Facilitator's phone number
  