Bump version

Author: cderv

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: rticles
 Type: Package
 Title: Article Formats for R Markdown
-Version: 0.21.10
+Version: 0.22
 Authors@R: c(
   person("JJ", "Allaire", role = "aut", email = "jj@rstudio.com"),
   person("Yihui", "Xie", role = c("aut"), email = "xie@yihui.name", comment = c(ORCID = "0000-0003-0645-5666")),