feat(install): support custom node bin path in shebang

[josephschmitt]

The custom path is set in the ghooks config right now because I couldn't think of a better place for it. Let me know if you have a better idea.

[codecov-io]

Codecov Report

Merging #225 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #225   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines          99    107    +8     
  Branches        4      4           
=====================================
+ Hits           99    107    +8

Impacted Files	Coverage Δ
lib/hook.template.raw	100% <ø> (ø)	⬆️
lib/hook.template.js	100% <100%> (ø)	⬆️

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[gtramontina]

Once again, thank you for the contribution!

That's a nice customization! Is this an issue you're currently experiencing?

Regarding where to put ghooks "settings", we've discussed it in the past #81. Haven't reached a consensus, though… But I think that #81 (comment) can be a good first step…

Thoughts?