docker: docker-compose.yml -> compose.yaml

Further removed the obsolete "version".

README.md

@@ -6,7 +6,7 @@ A bridge between ntfy and Alertmanager.
 
 ## Installation
 
-Simply use go build or the [docker image] with [docker-compose file].
+Simply use go build or the [docker image] with [docker compose file].
 `ntfy-alertmanager:latest` is built from the latest tagged release while
 `ntfy-alertmanager:dev` is built from the master branch.
 On Arch Linux you can install the [aur package] as well.
@@ -55,7 +55,7 @@ or write to me directly on matrix [@xenrox:xenrox.net].
 [mailing list]: https://lists.xenrox.net/~xenrox/public-inbox
 [@xenrox:xenrox.net]: https://matrix.to/#/@xenrox:xenrox.net
 [docker image]: https://hub.docker.com/r/xenrox/ntfy-alertmanager
-[docker-compose file]: https://git.xenrox.net/~xenrox/ntfy-alertmanager/tree/master/item/docker/docker-compose.yml
+[docker compose file]: https://git.xenrox.net/~xenrox/ntfy-alertmanager/tree/master/item/docker/compose.yaml
 [example configuration file]: https://git.xenrox.net/~xenrox/ntfy-alertmanager/tree/master/item/config.scfg
 [my deployment]: https://git.xenrox.net/~xenrox/ansible/tree/master/item/roles/alertmanager/templates/ntfy-alertmanager.j2
 [aur package]: https://aur.archlinux.org/packages/ntfy-alertmanager

docker/compose.yaml

@@ -1,4 +1,3 @@
-version: "3"
 services:
   ntfy-alertmanager:
     image: xenrox/ntfy-alertmanager:latest
@@ -14,5 +13,5 @@ services:
   #   image: redis:alpine
   #   container_name: redis
   #   restart: unless-stopped
-  #   volumes: 
+  #   volumes:
   #     - ./cache:/data