Custom extra (#89)

* Run rustfmt.

* Make extra customizable.

* Update to alpha 6.

examples/kusama_balance_transfer.rs

@@ -39,8 +39,13 @@ async fn transfer_balance() -> Result<sp_core::H256, Error> {
 
     // note use of `KusamaRuntime`
     substrate_subxt::ClientBuilder::<KusamaRuntime>::new()
-        .build().await?
-        .xt(signer, None).await?
-        .submit(balances::transfer::<KusamaRuntime>(dest.clone().into(), 10_000))
+        .build()
+        .await?
+        .xt(signer, None)
+        .await?
+        .submit(balances::transfer::<KusamaRuntime>(
+            dest.clone().into(),
+            10_000,
+        ))
         .await
 }

examples/submit_and_watch.rs

@@ -51,9 +51,8 @@ fn main() {
     match result {
         Ok(extrinsic_success) => {
             match extrinsic_success
-                .find_event::<(AccountId, AccountId, Balance)>(
-                    "Balances", "Transfer",
-                ) {
+                .find_event::<(AccountId, AccountId, Balance)>("Balances", "Transfer")
+            {
                 Some(Ok((_from, _to, value))) => {
                     println!("Balance transfer success: value: {:?}", value)
                 }