Drop GHC 8.6 and 8.4 from Tested-With

`store`, and therefore `serialise`, fails to build under these
configurations.

serialise: Release 0.2.6.1

cborg-json: Release 0.2.6.0

cborg: Release 0.2.10.0

cborg: Bump version

Merge pull request #300 from well-typed/finley/bumps

Remove 8.0 and 8.2 support, version bumps

Remove 8.0 and 8.2 support, version bumps

* Update changelogs
* Replace travis badge with haskell ci badge in readme
* Format some cabal files
* Remove travis folder

Merge pull request #300 from well-typed/finley/bumps

Remove 8.0 and 8.2 support, version bumps

Release serialise 0.2.4.0

Release cborg-json 0.2.3.0