Add aiofiles.os.renames function

[jpy-git]

The os module in the stdlib provides a function called os.renames that operates in a very similar way to os.rename but will create missing intermediate directories in the new path and delete directories corresponding to rightmost path segments of the old path. This PR adds the async version of that.

Docs: https://docs.python.org/3/library/os.html#os.renames

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

[codecov-commenter]

Codecov Report

Merging #120 (ffbcf43) into master (d010ff4) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #120      +/-   ##
==========================================
+ Coverage   89.59%   89.63%   +0.03%     
==========================================
  Files          10       10              
  Lines         298      299       +1     
==========================================
+ Hits          267      268       +1     
  Misses         31       31              

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

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[Tinche]

Great job, thanks!