Numpy warning float
Have tested using openpyxl 3.0.3 and 3.0.5 in Python 3.7, 3.8 and 3.9. numpy==1.20.0rc1 ``` .tox\py37\lib\site-packages\openpyxl\compat\numbers.py:41 {A_DIRECTORY}\.tox\py37\lib\site-packages\openpyxl\compat\numbers.py:41: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here. numpy.float, ```
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