Fix parsing boolean flags with explicit values

Fixes #2590

Avoid literal mention of "GitHub CLI" because hub already ranks too high
for those search terms and we don't want it to rank any higher.

Closes #2458

It's just a bad system for this kind of CLI application.

Closes https://github.com/github/hub/issues/2565

Add Void and Gentoo to installation instructions

see https://github.com/conda-forge/hub-feedstock for conda-forge hub package.

Fixes #2552

Ref. d99f308e

Fix typos

add /v2 to the module name to resolve the module path problem

Fixes  #2517

Linting Cleanup

This was put in place for Go < 1.11, which we no longer support in CI.

This reverts commit 75c54101.

remove bmizerany/assert

Add more Fish completions to pull-request