Track function rename in ligo.skymap
The function `ligo.skymap.postprocess.find_injection.find_injection_moc` was renamed to `ligo.skymap.postprocess.crossmatch.crossmatch`.
The function `ligo.skymap.postprocess.find_injection.find_injection_moc` was renamed to `ligo.skymap.postprocess.crossmatch.crossmatch`.