Log Message:
(devel/R-git2r) Updated 0.28.0 to 0.30.1

# git2r 0.30.1 (2022-03-15)

## CHANGES

* Added the build configuration script ('src/Makevars.ucrt') for
  Windows UCRT. Thanks to Tomas Kalibera for providing the patch.

* Added documentation about line endings in the diff
  function. Different operating systems handle line endings
  differently and to avoid problems in diffs, Git can be configured to
  handle these differences in line endings

# git2r 0.29.0 (2021-11-18)

## CHANGES

* Added a 'branch' argument to the 'init' function to make it possible
  to specify the branch name.

* Updated the build configuration script on Windows and MacOS to use
  libgit2 version 1.3.0.

* Updated the bundled libgit2 source code to version 1.3.0.

* Renamed the NEWS file to NEWS.md and changed to use markdown format
  style.