Update License and bump version

[PythonFZ]

Change License to License :: OSI Approved :: Apache Software License and update the version to 0.4.0

[codecov]

Codecov Report

Merging #257 (2465af8) into main (2745f62) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #257   +/-   ##
=======================================
  Coverage   71.81%   71.81%           
=======================================
  Files          26       26           
  Lines        1100     1100           
  Branches      211      211           
=======================================
  Hits          790      790           
  Misses        286      286           
  Partials       24       24           

Flag	Coverage Δ
unittests	71.81% <100.00%> (ø)

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Impacted Files	Coverage Δ
zntrack/core/__init__.py	100.00% <ø> (ø)
zntrack/core/base.py	86.90% <ø> (ø)
zntrack/core/functions/decorator.py	45.26% <ø> (ø)
zntrack/core/zntrackoption.py	83.33% <ø> (ø)
zntrack/dvc/__init__.py	97.61% <ø> (ø)
zntrack/interface/__init__.py	100.00% <ø> (ø)
zntrack/interface/base.py	45.45% <ø> (ø)
zntrack/project/__init__.py	100.00% <ø> (ø)
zntrack/project/zntrack_project.py	33.33% <ø> (ø)
zntrack/utils/__init__.py	100.00% <ø> (ø)
... and 7 more

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