Allow cancel of request

Author: ramonfincken

xolphin/endpoint/request.py

@@ -69,6 +69,11 @@ def send_note(self, id, message):
         return Base(self.client.post('requests/%d/notes' % id, {
             'message': message
         }))
+    
+    def cancel(self, id, reason):
+        return Base(self.client.post('requests/%d/cancel' % id, {
+            'reason': reason
+        }))    
 
     def get_notes(self, id):
         notes = []