Add migrate types

lib/txMsgHelpers.ts

@@ -26,6 +26,8 @@ const gasOfMsg = (msgType: MsgTypeUrl): number => {
       return 150_000;
     case MsgTypeUrls.Instantiate2:
       return 150_000;
+    case MsgTypeUrls.Migrate:
+      return 150_000;
     default:
       throw new Error("Unknown msg type");
   }

types/txMsg.ts

@@ -13,6 +13,7 @@ import {
   MsgExecuteContract,
   MsgInstantiateContract,
   MsgInstantiateContract2,
+  MsgMigrateContract,
 } from "cosmjs-types/cosmwasm/wasm/v1/tx";
 import { MsgTransfer } from "cosmjs-types/ibc/applications/transfer/v1/tx";
 
@@ -28,6 +29,7 @@ export const MsgTypeUrls = {
   Execute: "/cosmwasm.wasm.v1.MsgExecuteContract",
   Instantiate: "/cosmwasm.wasm.v1.MsgInstantiateContract",
   Instantiate2: "/cosmwasm.wasm.v1.MsgInstantiateContract2",
+  Migrate: "/cosmwasm.wasm.v1.MsgMigrateContract",
 } as const;
 
 export type MsgTypeUrl = (typeof MsgTypeUrls)[keyof typeof MsgTypeUrls];
@@ -44,4 +46,5 @@ export const MsgCodecs = {
   [MsgTypeUrls.Execute]: MsgExecuteContract,
   [MsgTypeUrls.Instantiate]: MsgInstantiateContract,
   [MsgTypeUrls.Instantiate2]: MsgInstantiateContract2,
+  [MsgTypeUrls.Migrate]: MsgMigrateContract,
 };