roxygen2 7.1.2

• The new @examplesIf tag can be used to create conditional
  examples. These examples only run if a specified condition
  holds (#962).

• roxygen2 is now licensed as MIT (#1163).

• Bug fix for upcoming stringr 2.0.0 release.

• Code blocks with language now add sourceCode to the generated div; this
  makes syntax highlighting more consistent across downlit/pandoc/knitr/roxygen2.

• Percent signs in markdown link targets, e.g. [text](https://foo/ba%20r)
  are now handled correctly (#1209).