Optimization errors from LogisticRegression are not reported

[gfournier]

Fit model ends with when an optimization error occurs during LogisticRegression fit:

in _check_optimize_result
).format(solver, result.status, result.message.decode("latin1"))
AttributeError: 'str' object has no attribute 'decode'

https://github.com/scikit-optimize/scikit-optimize/issues/981

[gfournier]

Downgrade scipy to 1.5.3 fixes temporary the issue:

pip install scipy==1.5.3