Update metadata.rs (#59)

src/metadata.rs

@@ -341,7 +341,7 @@ impl TryFrom<RuntimeMetadataPrefixed> for Metadata {
             return Err(Error::InvalidPrefix)
         }
         let meta = match metadata.1 {
-            RuntimeMetadata::V9(meta) => meta,
+            RuntimeMetadata::V10(meta) => meta,
             _ => return Err(Error::InvalidVersion),
         };
         let mut modules = HashMap::new();