parameters 0.24.2

Changes

• The effects argument in model_parameters() for classes merMod, glmmTMB,
  brmsfit and stanreg gets an additional "random_total" option, to return
  the overall coefficient for random effects (sum of fixed and random effects).

Bug fixes

• Fixed issue in model_parameters() for objects from package marginaleffects
  where columns were renamed when their names equaled to certain reserved words.