message: Add Cirrus CI badge to manifest
  Reflect changes from
diff: @@ -269,7 +269,7 @@ license-file = "..."
  # Optional specification of badges to be displayed on crates.io.
  #
  # - The badges pertaining to build status that are currently available are
  -# Appveyor, CircleCI, GitLab, Azure DevOps and TravisCI.
  +# Appveyor, CircleCI, Cirrus CI, GitLab, Azure DevOps and TravisCI.
  # - Available badges pertaining to code test coverage are Codecov and
  # Coveralls.
  # - There are also maintenance-related badges based on isitmaintained.com
  @@ -290,6 +290,9 @@ appveyor = { repository = "...", branch = "master", service = "github" }
  # Circle CI: `repository` is required. `branch` is optional; default is `master`
  circle-ci = { repository = "...", branch = "master" }
  +# Cirrus CI: `repository` is required. `branch` is optional; default is `master`
  +cirrus-ci = { repository = "...", branch = "master" }
  +
  # GitLab: `repository` is required. `branch` is optional; default is `master`
  gitlab = { repository = "...", branch = "master" }
  