Add msg update contract label (#1640)

* Add msg update contract label

* fix tests

proto/cosmwasm/wasm/v1/tx.proto

@@ -29,7 +29,7 @@ service Msg {
   rpc ExecuteContract(MsgExecuteContract) returns (MsgExecuteContractResponse);
   // Migrate runs a code upgrade/ downgrade for a smart contract
   rpc MigrateContract(MsgMigrateContract) returns (MsgMigrateContractResponse);
-  // UpdateAdmin sets a new   admin for a smart contract
+  // UpdateAdmin sets a new admin for a smart contract
   rpc UpdateAdmin(MsgUpdateAdmin) returns (MsgUpdateAdminResponse);
   // ClearAdmin removes any admin stored for a smart contract
   rpc ClearAdmin(MsgClearAdmin) returns (MsgClearAdminResponse);
@@ -78,6 +78,11 @@ service Msg {
   // Since: 0.42
   rpc StoreAndMigrateContract(MsgStoreAndMigrateContract)
       returns (MsgStoreAndMigrateContractResponse);
+  // UpdateContractLabel sets a new label for a smart contract
+  //
+  // Since: 0.43
+  rpc UpdateContractLabel(MsgUpdateContractLabel)
+      returns (MsgUpdateContractLabelResponse);
 }
 
 // MsgStoreCode submit Wasm code to the system
@@ -472,4 +477,20 @@ message MsgStoreAndMigrateContractResponse {
   bytes checksum = 2;
   // Data contains bytes to returned from the contract
   bytes data = 3;
-}
+}
+
+// MsgUpdateContractLabel sets a new label for a smart contract
+message MsgUpdateContractLabel {
+  option (amino.name) = "wasm/MsgUpdateContractLabel";
+  option (cosmos.msg.v1.signer) = "sender";
+
+  // Sender is the that actor that signed the messages
+  string sender = 1 [ (cosmos_proto.scalar) = "cosmos.AddressString" ];
+  // NewLabel string to be set
+  string new_label = 2;
+  // Contract is the address of the smart contract
+  string contract = 3 [ (cosmos_proto.scalar) = "cosmos.AddressString" ];
+}
+
+// MsgUpdateContractLabelResponse returns empty data
+message MsgUpdateContractLabelResponse {}