added pre-commit hooks with isort, black and flake8 #152
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This PR adds pre-commit hooks.
After installing the
pre-commit
package, when the developer commits, the code will be automatically checked for compliance with black and flake8. This should remove the need to run black manually each time, a practice that often introduces formatting changes different for different developers (different black versions used).The pre-commit config file is copied from gammapy.
A useful tutorial here.