add time option

[beepony]

could you consider to add time option like cURL?
eg:

[jkbrzt]

Thanks for the request, @beepony. This is something I plan to add.

Related feature requests: #243, #122

[hjacobs]

👍 for the timing option

[sigmavirus24]

So this is a bit different, we can't really offer %{time_connect}:%{time_starttransfer} we can give the time form when we sent the request to the time to the first byte received. Requests has no intention of really changing what it offers in this area since elapsed covers 98% of our users.

[vbvyas]

👍 Just having total time like postman does is good for most users

[jkbrzt]

Canonical issue: #243