fix readme for protocol-sdk for premint to reflect the possibility of…

… having an account as an argument (#237)

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## Description

The protocol-sdk readme doesnt take into consideration the fact that the account could be an `Account` and not just an `Address` - so this updates the readme to reflect this

## Motivation and Context

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## Does this change the ABI/API?

- [ ] This changes the ABI/API

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- [ ] My code follows the code style of this project.
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packages/protocol-sdk/README.md

@@ -235,7 +235,7 @@ async function createForFree({
   // public client that will simulate the transaction
   publicClient: PublicClient;
   // address of the token contract
-  creatorAccount: Address;
+  creatorAccount: Account | Address;
 }) {
   const premintClient = createPremintClient({
     chain: walletClient.chain!,
@@ -250,7 +250,7 @@ async function createForFree({
     checkSignature: true,
     // collection info of collection to create
     collection: {
-      contractAdmin: creatorAccount,
+      contractAdmin: typeof creatorAccount === "string" ? creatorAccount : creatorAccount.address,
       contractName: "Testing Contract",
       contractURI:
         "ipfs://bafkreiainxen4b4wz4ubylvbhons6rembxdet4a262nf2lziclqvv7au3e",