add bookdown import and tidy up rmd
diff --git a/DESCRIPTION b/DESCRIPTION
index 5bf0181..d391b08 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -17,6 +17,6 @@
 LazyData: true
 URL: https://github.com/brentthorne/posterdown
 BugReports: https://github.com/brentthorne/posterdown/issues
-Imports: rmarkdown, knitr, yaml, tinytex, ggplot2, rticles, kableExtra, Cairo
+Imports: rmarkdown, bookdown, knitr, yaml, tinytex, ggplot2, rticles, kableExtra, Cairo
 SystemRequirements: GNU make
 RoxygenNote: 6.1.1