Changes in version 0.1.1                        

  - Initial CRAN submission.
  - renvvv_restore(): Restores packages from the lockfile, continuing
    past individual failures and retrying them individually.
  - renvvv_update(): Updates packages to their latest available
    versions, continuing past individual failures.
  - renvvv_restore_and_update(): Combines restore and update in
    sequence.