resolve issue #75

[nurzhan-saktaganov]

• linter: don't capitalize error strings and capitalize log
• fix misspellings

What has been done? Why? What problem is being solved?
See issue #75

I didn't forget about (remove if it is not applicable):

• Changelog (see documentation for changelog format)

Related issues:

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 68.75000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 69.49%. Comparing base (6c00500) to head (0b615f9).

Files with missing lines	Patch %	Lines
providers/viper/provider.go	0.00%	2 Missing ⚠️
api.go	75.00%	1 Missing ⚠️
logger.go	50.00%	1 Missing ⚠️
replicaset.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #108   +/-   ##
=======================================
  Coverage   69.49%   69.49%           
=======================================
  Files          13       13           
  Lines        1262     1262           
=======================================
  Hits          877      877           
  Misses        337      337           
  Partials       48       48           

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