xsetroot: update to 1.1.3.

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
      Variable scope reductions as recommended by cppcheck
      Handle -Wsign-compare warnings
      gitlab CI: stop requiring Signed-off-by in commits
      xsetroot 1.1.3

(wiz)