Support logging-based progress meter

[tkf]

No description provided.

[codecov-io]

Codecov Report

Merging #63 into master will increase coverage by 0.09%.
The diff coverage is 89.01%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
+ Coverage   84.09%   84.18%   +0.09%     
==========================================
  Files          16       17       +1     
  Lines        1012     1100      +88     
==========================================
+ Hits          851      926      +75     
- Misses        161      174      +13

Impacted Files	Coverage Δ
src/Transducers.jl	100% <ø> (ø)	⬆️
src/dreduce.jl	100% <100%> (ø)	⬆️
src/progress.jl	88.76% <88.76%> (ø)
src/simd.jl	75% <0%> (-9.38%)	⬇️
src/comprehensions.jl	69.23% <0%> (-7.7%)	⬇️
src/processes.jl	91.85% <0%> (-0.75%)	⬇️
src/core.jl	68.42% <0%> (+0.03%)	⬆️
src/reduce.jl	96.61% <0%> (+1.69%)	⬆️

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