Allow upload on upgraded hackage

[swamp-agr]

Opening separate PR, since there is an error while uploading fay on hackage:

Uploading $HOME/projects/fay/dist-newstyle/sdist/fay-0.24.1.1.tar.gz...
Error uploading
$HOME/projects/fay/dist-newstyle/sdist/fay-0.24.1.1.tar.gz: http code 400
Error: Invalid package

'cabal-version' must be at least 1.10

Bumping to 1.10 did not helped.

[swamp-agr]

It seems that Travis CI is setting up cabal-install version 2.0.
It's not aligned properly with spec-version 3.0.
Trying adopt haskell-ci tool with current fay.cabal.

[swamp-agr]

Right now fay-tests cannot recognize installed ghc on CI server:

$ ${CABAL} v2-exec fay-tests -- --num-threads=4 -random 20
cabal: The program 'ghc' version >=7.0.1 is required but it could not be found.

The command "${CABAL} v2-exec fay-tests -- --num-threads=4 -random 20" exited with 1.

[swamp-agr]

As mentioned here (haskell/cabal#6722), autogen-modules section could be skipped for executables.

[swamp-agr]

Now I am able to reproduce CI behaviour locally for 8.8 branch (similar to #470).

[swamp-agr]

Next steps:

• resolve test errors one-by-one.

ghc-pkg: cannot find package fay-base

proposed solution: extend whatAGreatFramework with following logic:

• ✅ gather global, local package-db.
• ⚙️ if existed, add package-db from command-line arguments.
• ⚙️ ensure that parameter values are unique.

[swamp-agr]

After investigating, it was decided to postpone v2 handling as it is harder than I initially thought.
For now, downgrading Travis CI from v2 to v1 resolves ghc-pkg error: fay-base is missing.