.ci/appveyor.yml: Add pacman
Enables coverage of DistributionRequirement on Appveyor.
Related to https://gitlab.com/coala/package_manager/issues/66
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Enables coverage of DistributionRequirement on Appveyor.
Related to https://gitlab.com/coala/package_manager/issues/66