Tag 1.0.0-rc1

Signed-off-by: Johannes Löthberg <johannes@kyriasis.com>

configure.ac

-AC_INIT([pacman-contrib], [0.0.1], [pacman-contrib@lists.archlinux.org])
+AC_INIT([pacman-contrib], [1.0.0-rc1], [pacman-contrib@lists.archlinux.org])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_REQUIRE_AUX_FILE([tap-driver.sh])