PetroFit/petrofit: Version 0.4.1

Version 0.4.1 August 22nd 2022 PetroFit Enhancements CITATION.rst added to provide citing and credit information. #130 segm_mask can now take a list of labels which means it is possible to get multiple unmasked sources using masked_segm_image #143 Limits of param bounds in get_default_sersic_bounds changed. #143 r_eff min bound set to 1e-3. n min bound set to 0.1. ellip max bound set to 0.99. Add GenSersic2D model, which is a Sersic model with generalized ellipse isophot (boxy) parameter. #145 Implement PetroApprox which is a class with no-PSF polynomials which relate profile paramters such as C2080 and Sersic n. #146 General bug fixes and small changes Bug Fix: Example RMS image in docs was not the same size as the example data image. #114 Bug Fix: Model attribute bug fix in PSFConvolvedModel2D. #145 Print out PSF sum if it is not equal to 1. #145 Bug Fix: Change make_catalog kernel_size parameter to odd number. #14