Add fail text

[mrexox]

Closes #266

Summary ⚡

check:
  commands:
    cmd:
      run: exit 1
      fail_text: "Try 'exit 0' instead of 'exit 1'"

> $ lefthook run check
Lefthook v1.0.4
RUNNING HOOK: check

  EXECUTE > cmd


SUMMARY: (done in 0.00 seconds)
🥊  cmd: Try 'exit 0' instead of 'exit 1'