v0.021

  [New features]

  - The new 'git gerrit fetch' sub-command fetches a list of changes
    and creates local change-branches.

  [Changes]

  - The following commands now accept a list of changes as arguments
    instead of a single one: cherry-pick, reviewer, review, abandon,
    restore, revert, and submit.

  [Documentation]

  - The WORKFLOW section shows how the cherry-pick sub-command can be
    useful.