ncurlAio promises implementation

[shikokuchuo]

Closes #33

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.75862% with 5 lines in your changes missing coverage. Please review.

Project coverage is 90.14%. Comparing base (c9f135b) to head (7d1d859).

Files	Patch %	Lines
R/ncurl.R	72.22%	5 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
+ Coverage   89.57%   90.14%   +0.56%     
==========================================
  Files          23       23              
  Lines        3175     3195      +20     
==========================================
+ Hits         2844     2880      +36     
+ Misses        331      315      -16     

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