Add aiofiles.os.unlink function

[jpy-git]

The os module in the stdlib provides a function called os.unlink that is semantically identical to remove(). This PR adds the async version of that.

Docs: https://docs.python.org/3/library/os.html?highlight=os#os.unlink

I've added the relevant unit test in test_os.py

[codecov-commenter]

Codecov Report

Merging #123 (ebbb8c6) into master (db6c5be) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   89.66%   89.70%   +0.03%     
==========================================
  Files          10       10              
  Lines         300      301       +1     
==========================================
+ Hits          269      270       +1     
  Misses         31       31              

Impacted Files	Coverage Δ
src/aiofiles/os.py	100.00% <100.00%> (ø)

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[Tinche]

GJ, thanks!