@showprogress for asyncmap

[fredcallaway]

This one is pretty trivial, unless I'm missing something.

[codecov]

Codecov Report

Merging #183 (72dc266) into master (2fe41e1) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #183   +/-   ##
=======================================
  Coverage   95.66%   95.66%           
=======================================
  Files           1        1           
  Lines         415      415           
=======================================
  Hits          397      397           
  Misses         18       18           

Impacted Files	Coverage Δ
src/ProgressMeter.jl	95.66% <100.00%> (ø)

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[timholy]

Thanks! Sorry I missed this when you first submitted it.