Issues/101: fix logging

[komuw]

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Now,

What(What have you changed?)

• Fix a number of logging issues like;
  • like adding timestamp to logs
  • accepting NOTSET as a logging level
• while at it, simplify the token-bucket rate limiting algorithm

Why(Why did you change it?)

• Fixes: fix naz logger #101

References:

[codecov-io]

Codecov Report

Merging #105 into master will increase coverage by 0.15%.
The diff coverage is 91.11%.

@@            Coverage Diff            @@
##           master    #105      +/-   ##
=========================================
+ Coverage   86.05%   86.2%   +0.15%     
=========================================
  Files          12      12              
  Lines        1018    1044      +26     
=========================================
+ Hits          876     900      +24     
- Misses        142     144       +2

Impacted Files	Coverage Δ
naz/__version__.py	100% <ø> (ø)	⬆️
naz/hooks.py	84.21% <ø> (ø)	⬆️
naz/ratelimiter.py	97.14% <100%> (ø)	⬆️
cli/cli.py	68.06% <100%> (ø)	⬆️
naz/client.py	82.03% <100%> (ø)	⬆️
naz/logger.py	93.54% <89.18%> (-0.9%)	⬇️

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