Updated fsolve to work with arrays, as it's documented to do.
Updated fsolve to work with arrays, as it's documented to do.

Handeled it the same way Scipy does: https://github.com/scipy/scipy/blob/11509c4a98edded6c59423ac44ca1b7f28fba1fd/scipy/optimize/minpack.py#L208.

AllenDowney/ModSimPy,AllenDowney/ModSimPy,AllenDowney/ModSimPy