Deprecate utils.is_str

[iMichka]

We don't support Python 2 since a long time now

[codecov-commenter]

Codecov Report

Merging #168 (fa56370) into develop (ce011e1) will decrease coverage by 0.03%.
Report is 2 commits behind head on develop.
The diff coverage is 84.61%.

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@@             Coverage Diff             @@
##           develop     #168      +/-   ##
===========================================
- Coverage    91.71%   91.68%   -0.03%     
===========================================
  Files          138      138              
  Lines        10736    10734       -2     
===========================================
- Hits          9847     9842       -5     
- Misses         889      892       +3     

Flag	Coverage Δ
unittests	91.68% <84.61%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/pygccxml/parser/linker.py	90.09% <0.00%> (-0.05%)	⬇️
src/pygccxml/utils/utils.py	73.45% <0.00%> (-1.70%)	⬇️
src/pygccxml/declarations/container_traits.py	90.27% <100.00%> (ø)
src/pygccxml/declarations/type_traits.py	91.53% <100.00%> (ø)
src/pygccxml/parser/config.py	90.22% <100.00%> (-0.05%)	⬇️
src/pygccxml/parser/project_reader.py	80.00% <100.00%> (ø)
src/pygccxml/parser/scanner.py	96.28% <100.00%> (ø)
unittests/find_container_traits_tester.py	95.55% <100.00%> (-0.05%)	⬇️