Upgrade and drop '*-doc' package, moving keybindings to their respective
shell completions package. This will make them consistent with their
descriptions.
d5cfcd38e disabled vetting while running the test suite due to failures
because of an update in Go.
This has now been fixed upstream, so enable vetting again by removing
the relevant patch.
Since Go 1.10, they enabled vetting by default when running tests. This
reveals issues in the thests which should be fixed upstream, but for
now, disable vetting to let the tests pass again.
An upstream issue[0] has been created. Untill then, apply a patch to the
Makefile to disable vetting.
[0]: https://github.com/junegunn/fzf/issues/1236
