pre-commit and requirements

• added a pre-commit git-hook configuration
• lowered requirement for numpy. 1.12 is the 2017 version, which I choose arbitrarily, could potentially be higher, just the latest version is not supported yet e.g. by numba.

could close #1 (closed)

added CI/CD label

requested review from @christophknote

assigned to @FObersteiner

mentioned in issue #1 (closed)

changed the description

approved this merge request

added 1 commit

• 3a96ab2b - formatting

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merged