fix: comas in default values for cleanenv parser

[g4s8]

Fix: #70

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 71.60%. Comparing base (c33fde5) to head (ba02d73).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
tags/parser.go	94.73%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
+ Coverage   71.49%   71.60%   +0.11%     
==========================================
  Files          32       32              
  Lines        1105     1113       +8     
==========================================
+ Hits          790      797       +7     
- Misses        274      275       +1     
  Partials       41       41              

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