Add I/O operation speed decorator

[xakep666]

Unit variants: KiB, kB, no unit Example gifs:

[codecov-io]

Codecov Report

Merging #23 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #23   +/-   ##
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  Coverage   75.49%   75.49%           
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  Files           8        8           
  Lines         551      551           
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  Hits          416      416           
  Misses        121      121           
  Partials       14       14

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[vbauerster]

Here I'm using speed decorator with simple speed calculation algorithm, it's not part of mpb though. What is a benefit for having speed decorator with complex calculation, like the one you propose?

[xakep666]

I wanted to show instantaneous speed but your method is better because it's simple and requires only basic filtering (NaN, +-Inf). I`ll re-push comits with it.

[xakep666]

@vbauerster made requested changes

[vbauerster]

Благодарю!