feat(go-critic): Fallback to 'gocritic' if 'go-critic' not found

[TekWizely]

Not all install-sources (brew, etc) have migrated to the new name (go-critic), so we provide a transparent fall-back to gocritic when it's the only version present.

If neither are present, we still use go-critic, so that it is used in the error reporting when verify_hook_cmd fails.

---

Replaces #50

cc: @mcdonnnj - I wanted the checks to go in the other direction (prefer new, settle on old) and to have go-critic be in the error message if neither present.

Additionally, I've created go-critic/go-critic#1525 on the go-critic project asking them to address the issue.

[mcdonnnj]

Tested this locally and it looks good:

$ command -v go-critic
$ command -v gocritic
/home/linuxbrew/.linuxbrew/bin/gocritic
$ pre-commit try-repo ../../TekWizely/pre-commit-golang/ go-critic --verbose --all-files
===============================================================================
Using config:
===============================================================================
repos:
-   repo: ../../TekWizely/pre-commit-golang
    rev: 05f55c29a0c5cc7def5fdb4a3932b76141d58506
    hooks:
    -   id: go-critic
===============================================================================
[INFO] Initializing environment for ../../TekWizely/pre-commit-golang.
go-critic................................................................Passed
- hook id: go-critic
- duration: 20.84s

[mcdonnnj]

Just a minor typo I noticed while reviewing.

Suggested change

	# If not found, but old name found, us it
	# If not found, but old name found, use it