chore: update docker compose command in README.md (#99)

Author: Ivansete-status

README.md

@@ -21,23 +21,21 @@ export ETH_FROM=0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266
 export RLN_RELAY_EPOCH_SEC=10
 export RLN_RELAY_MSG_LIMIT=2
 export MAX_MESSAGE_LIMIT=100  # Contract's message limit. Needs to be higher or equal than RLN_RELAY_MSG_LIMIT, otherwise nodes won't start correctly.
-
-docker-compose --compatibility up -d
 ```
 
-## warning
-
-in case arp tables are overflowing:
-
+Run the following command
 ```
-sysctl net.ipv4.neigh.default.gc_thresh3=32000
+docker compose up -d
 ```
+(tested with Docker Compose version v2.28.1. Notice that we don't support docker compose v1)
 
-Compose V2 users should spin up the containers with the following command:
+## Warning
 
-```
-docker-compose --compatibility up -d
-```
+In case arp tables are overflowing:
+
+  ```
+  sysctl net.ipv4.neigh.default.gc_thresh3=32000
+  ```
 
 # Infrastructure