Update to set mortal_period in client

examples/transfer_subscribe.rs

@@ -27,8 +27,6 @@ use substrate_subxt::{
     EventSubscription,
     EventsDecoder,
     PairSigner,
-    SignedOptions,
-    DEFAULT_ERA_PERIOD,
 };
 
 #[async_std::main]
@@ -46,7 +44,6 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     sub.filter_event::<TransferEvent<_>>();
     client.transfer(
         &signer,
-        SignedOptions { era_period: Some(DEFAULT_ERA_PERIOD) },
         &dest,
         10_000
     ).await?;