🐛 Fix parse_it when given Mapping contains bytes values/keys

[Ousret]

Pull Request

My patch is about

• 🐛 Bugfix
• ⬆️ Improvement
• 📝 Documentation
• ✔️ Tests
• ❇️ Feature

Checklist

• I accept that my PR will be distributed under the MIT license.
• Test cases added for changed code if necessary.

Describe what you have changed in this PR.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (6c2fd5d) 90.20% compared to head (eec6e66) 90.25%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   90.20%   90.25%   +0.05%     
==========================================
  Files           8        8              
  Lines        1297     1314      +17     
==========================================
+ Hits         1170     1186      +16     
- Misses        127      128       +1     

Files	Coverage Δ
kiss_headers/api.py	92.59% <100.00%> (+1.23%)	⬆️
kiss_headers/models.py	92.39% <100.00%> (+0.10%)	⬆️
kiss_headers/version.py	100.00% <100.00%> (ø)
kiss_headers/utils.py	91.02% <80.00%> (-0.82%)	⬇️

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