Merge pull request #743 from e2jk/docker-hostname

Add `hostname` to docker-compose

docker-compose.yml.example

@@ -6,6 +6,7 @@ services:
   pihole:
     container_name: pihole
     image: pihole/pihole:latest
+    hostname: pi.hole
     # For DHCP it is recommended to remove these ports and instead add: network_mode: "host"
     ports:
       - "53:53/tcp"