CRAN Release v0.9.0

Packrat 0.9.0

• Packrat now supports restoring packages hosted in private repositories on
  GitHub, GitLab, and Bitbucket. To enable this, set the option
  packrat.authenticated.downloads.use.renv to TRUE. curl must be available
  on your system to take advantage of this capability. For authenticated
  downloads, you must make GITHUB_PAT, GITLAB_PAT, and/or
  BITBUCKET_USERNAME and BITBUCKET_PASSWORD available in Packrat's
  environment, as appropriate. These environment variables are hidden from
  package install processes.
• Correctly discover dependencies in a project beneath a directory hierarchy
  containing "data". (#684)
• Take an renv update to include a fix regarding download.file.method
  handling. (#683)
• Packrat now masks environment variables commonly used for Git service account
  authentication from subprocesses used to install packages. This behavior can
  be disabled by setting the option packrat.mask.git.service.envvars to
  FALSE. (#682)
• Users can mask additional arbitrary environment variables from the sub-process
  that run package installation tasks, by setting the option
  packrat.masked.envvars to a character vector of variable names to mask.
  These variables are masked whether or not packrat.mask.git.service.envvars
  has been set to FALSE. (#682)
• Change how Packrat selects a tar binary. Previously, Packrat would force the
  use of R's internal tar implementation, which cannot handle long filepaths.
  Now, if a TAR environment variable exists, Packrat will use that. Otherwise,
  it will either look for a tar binary on the PATH on Unix, or look for the
  system tar on Windows. If no binary is found in those locations, it will use
  R's internal tar implementation. (#648)
• Allow GitLab downloads from repositories having paths (#699).
• Update some RStudio references to Posit.