[fix] add -s to curl (#14)

Author: lookfirst

README.md

@@ -60,6 +60,6 @@ Sync speed depends on your L1 node, as the majority of the chain is derived from
 ```
 echo Latest synced block behind by: \
 $((($( date +%s )-\
-$( curl -d '{"id":0,"jsonrpc":"2.0","method":"optimism_syncStatus"}' -H "Content-Type: application/json" http://localhost:7545 |
+$( curl -s -d '{"id":0,"jsonrpc":"2.0","method":"optimism_syncStatus"}' -H "Content-Type: application/json" http://localhost:7545 |
    jq -r .result.unsafe_l2.timestamp))/60)) minutes
 ```