server: Add missing Tokio feature "macros"

Cargo.toml

@@ -37,7 +37,7 @@ default = ["tcp", "rtu"]
 rtu = ["tokio-serial", "futures-util/sink"]
 tcp = ["tokio/net", "futures-util/sink"]
 sync = ["tokio/rt"]
-server = ["futures", "socket2/all", "tokio/rt", "tokio/rt-multi-thread"]
+server = ["futures", "socket2/all", "tokio/macros", "tokio/rt", "tokio/rt-multi-thread"]
 tcp-server-unstable = ["tcp", "server"]
 
 [badges]