Added support for env vars

[akoutmos]

This allows tasks to have environment variables passed to them so you can do things like the following and ensure that the proper items are in place before running tests:

tasks: [
  {:cmd, "mix ecto.setup", env: [{"MIX_ENV", "test"}]},
  "mix test"
]

If no args are passed, and empty list is provided to System.cmd/3

[coveralls]

Pull Request Test Coverage Report for Build 143

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.6%) to 83.051%

---

Totals
Change from base Build 142:	0.6%
Covered Lines:	49
Relevant Lines:	59

---

💛 - Coveralls

[akoutmos]

Friendly bump :)

[qgadrian]

Hey @akoutmos sorry I didn't have to take a look at this, I want to get ride of the TODO in the code instead of allowing it on credo.

I will merge it ASAP, thanks for the contribution! 🎉

[akoutmos]

Thanks for getting back to me! Are you talking about this one? https://github.com/qgadrian/elixir_git_hooks/blob/master/lib/mix/tasks/git_hooks/run.ex#L77

[akoutmos]

Want me to remove the TODO in this PR?

[qgadrian]

@akoutmos, please do. I updated master branch with the deprecation so no more TODOs pending anymore

[akoutmos]

Reverted the credo change. Let me know if there is anything else you would like me to do :)

[qgadrian]

Thanks for the contribution @akoutmos 🎉

[akoutmos]

No problem :). Thanks for the awesome lib!!