chain: Remove unused method

Author: tilacog

chain/ethereum/src/adapter.rs

@@ -1,7 +1,6 @@
 use anyhow::Error;
 use ethabi::{Error as ABIError, Function, ParamType, Token};
 use futures::Future;
-use graph::semver::Version;
 use mockall::automock;
 use mockall::predicate::*;
 use std::cmp;
@@ -656,8 +655,6 @@ pub trait EthereumAdapter: Send + Sync + 'static {
         call: EthereumContractCall,
         cache: Arc<dyn EthereumCallCache>,
     ) -> Box<dyn Future<Item = Vec<Token>, Error = EthereumContractCallError> + Send>;
-
-    fn api_version(&self) -> Version;
 }
 
 #[cfg(test)]

chain/ethereum/src/ethereum_adapter.rs

@@ -5,7 +5,6 @@ use futures::prelude::*;
 use graph::components::transaction_receipt::LightTransactionReceipt;
 use graph::data::subgraph::UnifiedMappingApiVersion;
 use graph::prelude::StopwatchMetrics;
-use graph::semver::Version;
 use graph::{
     blockchain::{block_stream::BlockWithTriggers, BlockPtr, IngestorError},
     prelude::{
@@ -792,9 +791,6 @@ impl EthereumAdapter {
 
 #[async_trait]
 impl EthereumAdapterTrait for EthereumAdapter {
-    fn api_version(&self) -> Version {
-        todo!()
-    }
 
     fn url_hostname(&self) -> &str {
         &self.url_hostname