Added --force-rm to compose build.

It's a flag passed to docker build that removes the intermediate
containers left behind on fail builds.

Signed-off-by: Adrian Budau <budau.adi@gmail.com>

contrib/completion/zsh/_docker-compose

@@ -192,6 +192,7 @@ __docker-compose_subcommand() {
         (build)
             _arguments \
                 $opts_help \
+                '--force-rm[Always remove intermediate containers.]' \
                 '--no-cache[Do not use cache when building the image]' \
                 '--pull[Always attempt to pull a newer version of the image.]' \
                 '*:services:__docker-compose_services_from_build' && ret=0