chore: fix MsgRewardsOptOut

Author: achilleas-kal

README.md

@@ -80,6 +80,7 @@ Note that the [sync client](https://github.com/InjectiveLabs/sdk-python/blob/mas
 ### Changelogs
 **0.5.9.0**
 * Re-gen proto
+* Fix MsgRewardsOptOut
 * Remove pysha3 dependency
 
 **0.5.8.8**

pyinjective/composer.py

@@ -340,9 +340,9 @@ def MsgBatchCancelSpotOrders(self, sender: str, data: List):
             sender=sender, data=data
         )
 
-    def MsgRewardsOptOut(self, sender: str, dmm_account: str):
+    def MsgRewardsOptOut(self, sender: str):
         return injective_exchange_tx_pb.MsgRewardsOptOut(
-            sender=sender, dmm_account=dmm_account
+            sender=sender
         )
 
     def MsgCreateDerivativeLimitOrder(