Switch to GHC 8.2

[viviag]

Update resolver.

Problem: even with most recent resolver it dies (nightly-2017-12-05).
it dies with no error message on stdout (inproc "egrep" [pullExpr] (input gitHistory)) in example.

[viviag]

Closed in 881b85b

[viviag]

Still dies with no error message on the first pipe on the way.
Failing command: view $ inproc "git" ["describe", "--tags", "origin/master"] empty
When trying to use inprocWithErr I see Left ... but it even dies.
It works on a project with tags and fails after.

So it fails while processing empty stream. Test in GHCI:

>view $ inproc "git" ["describe", "--tags"] empty
fatal: Имена не найдены, не могу ничего описать.
*** Exception: ExitFailure 128

Found on tldp.org: 128: Invalid argument to exit

[viviag]

This is correct behavior of Turtle. Now I can catch exception here. But I would prefer to wait for resolution of members on relevant discussion.
Awaiting Gabriella439/turtle#269

Resolution: use exceptions.
Also it requires switch to git version of Turtle.