brms 2.19.0

New Features

• Model unstructured autocorrelation matrices via the unstr term
  thanks to the help of Sebastian Weber. (#1435)
• Model ordinal data with an extra category (non-response or similar)
  via the hurdle_cumulative family thanks to Stephen Wild. (#1448)
• Improve user control over model recompilation via argument recompile
  in post-processing methods that require a compiled Stan model.
• Extend control over the point_estimate feature in prepare_predictions
  via the new argument ndraws_point_estimate.
• Add support for the latent projection available in
  projpred versions >= 2.4.0. (#1451)

Bug Fixes

• Fix a Stan syntax error in threaded models with lasso priors. (#1427)
• Fix Stan compilation issues for some of the more special
  link functions such as cauchit or softplus.
• Fix a bug for predictions in projpred, previously requiring more variables
  in newdata than necessary. (#1457, #1459, #1460)