Log Message:
xkill: update to 1.0.6.

Alan Coopersmith (8):
      Update README for gitlab migration
      Update configure.ac bug URL for gitlab migration
      gitlab CI: add a basic build test
      Build xz tarballs instead of bzip2
      gitlab CI: stop requiring Signed-off-by in commits
      Variable scope reductions as recommended by cppcheck
      gitlab CI: explictly list GNU make to be installed in build environment
      xkill 1.0.6