Dependency issue with Numba 0.54

[Mannu Arneja]

This error occurs when generating pixplot:
ImportError: numpy.core.multiarray failed to import

Issue with new release noted here: https://github.com/numba/numba/issues/7339

A solution until that is sorted is to specify previous version in setup.py
'numba==0.53'

[Douglas Duhaime]

Thanks @mannu-arneja ! If you'd like to send a pull request to change that line we'll be happy to merge it!

[Mannu Arneja]

Thanks @duhaime for this great project!