CRAN release v0.30

Author: yihui

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: xaringan
 Type: Package
 Title: Presentation Ninja
-Version: 0.29.2
+Version: 0.30
 Authors@R: c(
     person("Yihui", "Xie", role = c("aut", "cre"), email = "xie@yihui.name", comment = c(ORCID = "0000-0003-0645-5666")),
     person(given = "Posit Software, PBC", role = c("cph", "fnd")),