Update mithril-client version (0.8.18 -> 0.10.4) (#110)

Author: stanislav-tkach

rust/cardano-chain-follower/Cargo.toml

@@ -15,8 +15,7 @@ pallas = { version = "0.30.1", git = "https://github.com/input-output-hk/catalys
 pallas-hardano = { version = "0.30.1", git = "https://github.com/input-output-hk/catalyst-pallas.git", rev = "9b5183c8b90b90fe2cc319d986e933e9518957b3" }
 pallas-crypto = { version = "0.30.1", git = "https://github.com/input-output-hk/catalyst-pallas.git", rev = "9b5183c8b90b90fe2cc319d986e933e9518957b3" }
 
-# cspell: words licence
-mithril-client = { version = "0.8.18", default-features = false, features = [
+mithril-client = { version = "0.10.4", default-features = false, features = [
     "full",
     "num-integer-backend",
 ] }

rust/cardano-chain-follower/src/mithril_snapshot_config.rs

@@ -359,15 +359,11 @@ impl MithrilSnapshotConfig {
             .map_err(|e| Error::MithrilClient(self.chain, url.clone(), e))?;
 
         // Check we have a snapshot, and its for our network.
-        match snapshots.first() {
-            Some(snapshot) => {
-                let _aggregator_network =
-                    Network::from_str(&snapshot.beacon.network).map_err(|_err| {
-                        Error::MithrilClientNetworkMismatch(
-                            self.chain,
-                            snapshot.beacon.network.clone(),
-                        )
-                    })?;
+        match snapshots.first().and_then(|s| s.beacon.network.as_ref()) {
+            Some(network) => {
+                let _aggregator_network = Network::from_str(network.as_str()).map_err(|_err| {
+                    Error::MithrilClientNetworkMismatch(self.chain, network.clone())
+                })?;
             },
             None => return Err(Error::MithrilClientNoSnapshots(self.chain, url)),
         }