chore: add space

Author: achilleas-kal

README.md

@@ -83,6 +83,7 @@ Note that the [sync client](https://github.com/InjectiveLabs/sdk-python/blob/mas
 * Add explorer channel and stub
 
 *BREAKING CHANGE*
+
 Clients using [Custom Network](https://github.com/InjectiveLabs/sdk-python/blob/master/pyinjective/constant.py#L157) must now set grpc_explorer_endpoint during init
 
 **0.5.8.7**