[Buildah] Buildah v1.18.0 Release Announcement

Hi All, Just a quick note to announce the next version of Buildah, v1.18.0.  It is primarily a bug fix release, but does include more secure container image short name handling and you can now specify the policy type of the pull command.  For more details, checkout the Release Announcement: https://buildah.io/releases/2020/12/03/Buildah-version-v1.18.0.html Best Wishes, t