cmd: don't output timestamps if no TTY present, fix #130

[roman-khimov]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 3.06%. Comparing base (24589cb) to head (e83c08f).
Report is 1 commits behind head on master.

Files	Patch %	Lines
cmd/neo-exporter/monitor.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #142      +/-   ##
=========================================
- Coverage    3.07%   3.06%   -0.01%     
=========================================
  Files          18      18              
  Lines         975     978       +3     
=========================================
  Hits           30      30              
- Misses        943     946       +3     
  Partials        2       2              

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