Add pwd

[i4ki]

So simple... do makes sense testing this?
I made a test, but feels like I'm testing os.Getwd and fmt.Println from Go.. there's no much code here.
Makes sense?

Closes #244

[codecov-io]

Codecov Report

Merging #244 into master will decrease coverage by 0.1%.
The diff coverage is 23.07%.

@@            Coverage Diff             @@
##           master     #244      +/-   ##
==========================================
- Coverage   57.05%   56.95%   -0.11%     
==========================================
  Files          26       27       +1     
  Lines        4403     4416      +13     
==========================================
+ Hits         2512     2515       +3     
- Misses       1651     1660       +9     
- Partials      240      241       +1

Impacted Files	Coverage Δ
stdbin/mkdir/main.go	23.07% <23.07%> (ø)

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[i4ki]

oops, the only code here is: https://github.com/NeowayLabs/nash/pull/244/files#diff-7e0bdb2b11a48277e00f1e8c58446148
the others are from #240 that I merged here also

[vitorarins]

This is going to be a big list 😅

[i4ki]

yeah, we need to improve this =)

[vitorarins]

@tiago4orion I agree that the code itself is really simple. But does it make sense to have a nash script testing the binary?

[i4ki]

@vitorarins The code is obviously right.

'avoiding bugs by avoiding code' seems to be the only true fact of computer science