Rename binary units according to IEC 60027 and add decimal units (SI)

[muXxer]

This PR fixes #28

[muXxer]

@vishr maybe you can have a look at this PR? :)
Thank you! :)

[muXxer]

4 months pending? :(

[aldas]

@muXxer it looks good but please change both Format() method signatures back as they were and I will merge this PR.
This is unnecessary breaking change. If you know which PrefixType you want - you can call specific method also.

[muXxer]

Oh I just saw your comment now @aldas 😅

Is it really a breaking change, since the method signatures were extended by a variadic parameter?
If you don't pass the variadic parameter, it defaults back to the former behaviour.

[aldas]

This is unlikely but if someone has made interface for Bytes.Format(b int64) string that previous Bytes struct satisfied with its public method - then this is a breaking change.

[muXxer]

@aldas
Sorry it took so long, almost forgot about that PR :)
Shouldn't be breaking now in terms of public methods.

[codecov-commenter]

Codecov Report

Merging #45 (ad3d548) into master (4919956) will increase coverage by 1.37%.
The diff coverage is 92.22%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   59.26%   60.64%   +1.37%     
==========================================
  Files           6        6              
  Lines         518      625     +107     
==========================================
+ Hits          307      379      +72     
- Misses        208      242      +34     
- Partials        3        4       +1     

Impacted Files	Coverage Δ
bytes/bytes.go	88.97% <92.22%> (-7.52%)	⬇️
color/color.go	88.00% <0.00%> (-0.36%)	⬇️
email/email.go	0.00% <0.00%> (ø)
random/random.go	100.00% <0.00%> (ø)
log/log.go	52.94% <0.00%> (+1.99%)	⬆️

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[aldas]

better late than never