README: added --check option

README.md

@@ -12,8 +12,7 @@ nixos-rebuild switch -I nixos-config=./hosts/containers/$HOST/configuration.nix
 
 ```shell
 nixops create  hq.nixops -d hq
-nixops deploy -d hq --debug --include=dhcp --force-reboot
-nixops deploy -d hq --include=grafana -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-18.09.tar.gz --force-reboot
+nixops deploy -d hq --check --include=dhcp
 ```
 
 # Secrets