CRAN release v0.21

Author: yihui

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: rticles
 Type: Package
 Title: Article Formats for R Markdown
-Version: 0.20.9
+Version: 0.21
 Authors@R: c(
   person("JJ", "Allaire", role = "aut", email = "[email protected]"),
   person("Yihui", "Xie", role = c("aut", "cre"), email = "[email protected]", comment = c(ORCID = "0000-0003-0645-5666")),