Increase connection timeout for imports

[markus1189]

TL;DR

Set the response timeout from 1s to 30s, because 1s is much too optimistic.

Why

From time to time I have the problem luck of being with a rather modest internet connection (~376Kb/s) and I noticed that even running something simple like:

let not = https://ipfs.io/ipfs/QmcTbCdS21pCxXysTzEiucDuwwLWbLUWNSKwkJVfwpy2zK/Prelude/Bool/not
in  not True

via dhall fails with ConnectionTimeout. I saw that the connection response timeout is set to 1 second, which is much too short for a bad internet connection.

How

To address this, I raised the time limit from 1 second to 30 seconds, because that is also the time that is used in the default managerResponseTimeout (https://hackage.haskell.org/package/http-client-0.5.6.1/docs/src/Network-HTTP-Client-Types.html#ManagerSettings).

With that setting I can finally use dhall even when I don't have a fast internet connection available. :D

[Gabriel439]

Yeah, great idea! Sorry about picking such a strict default initially