upgrade to reveal.js-3.3.0
diff --git a/R/revealjs_presentation.R b/R/revealjs_presentation.R
index 3778568..e27cb1c 100644
--- a/R/revealjs_presentation.R
+++ b/R/revealjs_presentation.R
@@ -192,7 +192,7 @@
     args <- c()
     
     # reveal.js
-    revealjs_path <- system.file("reveal.js-3.2.0", package = "revealjs")
+    revealjs_path <- system.file("reveal.js-3.3.0", package = "revealjs")
     if (!self_contained || identical(.Platform$OS.type, "windows"))
       revealjs_path <- relative_to(
         output_dir, render_supporting_files(revealjs_path, lib_dir))