Fix softnanotools.generate "project" errors

[shanilpanara]

Quick fix to issues #22 and #21

• For #22... Set python version default to python 3.6 +
• For #21... git branch -M main will change default branch name to main regardless of the previous name!

[codecov-commenter]

Codecov Report

Merging #23 (f88481c) into main (43eac8b) will decrease coverage by 1.62%. The diff coverage is 25.00%.

:exclamation: Current head f88481c differs from pull request most recent head e3d9d9e. Consider uploading reports for the commit e3d9d9e to get more accurate results

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   80.89%   79.27%   -1.62%     
==========================================
  Files          17       17              
  Lines         403      415      +12     
  Branches       47       47              
==========================================
+ Hits          326      329       +3     
- Misses         60       69       +9     
  Partials       17       17              

Impacted Files	Coverage Δ
softnanotools/generate/_project.py	66.03% <25.00%> (-12.02%)	:arrow_down:

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[shanilpanara]

Never mind, this is NOT fixed....

git init does not create a branch by default?

[shanilpanara]

Might be easiest to mandate git versions >2.28 to run softnanotools.generate