chore: update line to change

Author: achilleas-kal

README.md

@@ -84,7 +84,7 @@ Note that the [sync client](https://github.com/InjectiveLabs/sdk-python/blob/mas
 
 *BREAKING CHANGES*
 
-- Clients using [Custom Network](https://github.com/InjectiveLabs/sdk-python/blob/master/pyinjective/constant.py#L157) must now set grpc_explorer_endpoint during init
+- Clients using [Custom Network](https://github.com/InjectiveLabs/sdk-python/blob/master/pyinjective/constant.py#L166) must now set grpc_explorer_endpoint during init
 
 **0.5.8.7**
 * Add testnet ini metadata