brms 2.3.1

New features

• Allow censoring and truncation in zero-inflated and hurdle models. (#430)
• Export zero-inflated and hurdle distribution functions.

Other changes

• Improve sampling efficiency of the ordinal families
  cumulative, sratio, and cratio. (#433)
• Allow to specify a single k-fold subset in method kfold. (#441)

Bug fixes

• Fix a problem in launch_shinystan due to which the
  maximum treedepth was not correctly displayed thanks to
  Paul Galpern. (#431)