default `User-Agent` value

History

Time	Change
2016-04-03 09:35:53+00:00	Created
2016-04-03 09:35:53+00:00	Associated with 276
2017-09-26 03:30:09+00:00	Disassociated from 276
2017-09-26 03:30:15+00:00	Associated with 1588