Filter schedules by multiple absence values (#372)

Author: sunsations

sections/schedules.md

@@ -63,7 +63,7 @@ Additionally, the following parameters can be supplied:
 - **from** – "2017-05-01"
 - **to** – "2017-05-31"
 - **user_id** – 123
-- **absence_code** – 1, 2, 3, 4, 5 (unplannable absence, public holiday, sick day, holiday, absence)
+- **absence_code** – 1, 2, 3, 4, 5 (unplannable absence, public holiday, sick day, holiday, absence) – (also multiple values, comma-separated)
 - **holiday_request_id** – 123 (the ID of the holiday request filters all holiday absences for this request)
 
 ## GET /schedules/{id}