enforce a min % of code coverage

.gitignore

 .DS_Store
 .ipynb_checkpoints
 
-# pytest cache 
+# pytest cache
 *.pytest_cache/
 
 # Ignore compiled protobuf files.
 # Python virtual environment
 venv/
 .mypy_cache/
+
+# Code coverage report
+.coverage

setup.cfg

+[coverage:report]
+fail_under = 60