as_draws_df() and expand_grid()

Noteworthy changes include:

• replacing the depreciated posterior_samples() function with the new posterior::as_draws_df()-based workflow,
• replacing my incorrect use of tidyr::expand() with a more appropriate tidyr::expand_grid() workflow,
• adopting the new linewidth argument for several ggplot2 geoms, and
• refitting all models with brms 2.18.0.

zotero + brms 2.15.0

Noteworthy changes are that

• all models have been refit with brms 2.15.0;
• we have updated the in-text citations and reference sections using BibTex, Better BibTeX, and zotero;
• I fixed code breaks due to various updates in the tidyverse packages; and
• I fixed a handful of typos and other small gaffes.

brms 2.10.3 update!

This if the fist official release. The 1.0.0 version was published with bookdown in July 2018, before I knew how to issue releases on GitHub. Version 1.1.0 includes a lot of changes. Most notably,

• all models have been refit with brms 2.10.3,
• the introduction to Bayesian information criteria now reflects the updates introduced in brms 2.10.0,
• I have updated the multivariate model code with the mvbind() and mvbf() functions,
• I have made greater use of the handy tidybayes package for post-processing models,
• I have updated and simplified a lot of the tidyverse code,
• all fit objects have sequential names and are now saved in .rda files in the fits folder on GitHub,
• I have substantially increased the amount of Hayes quotes,
• I added more statistical formulas throughout the text,
• I added a version of Chapter 14, which includes warnings about relying on cross-sectional mediation, and
• the various R objects enjoy simpler and more standardized names.