Update Readme

Author: jeremiahAI

README.md

@@ -88,7 +88,7 @@ Set the public key, encryption key and other required parameters. The `RavePayMa
 | setPublicKey(publicKey) | Merchant's public key. Get your merchant keys here for [ staging](https://flutterwavedevelopers.readme.io/blog/how-to-get-your-staging-keys-from-the-rave-sandbox-environment) and [live](https://flutterwavedevelopers.readme.io/blog/how-to-get-your-live-keys-from-the-rave-dashboard)| `String` | Required
 | setEncryptionKey(encryptionKey) | Merchant's encryption key. Get your merchant keys here for [ staging](https://flutterwavedevelopers.readme.io/blog/how-to-get-your-staging-keys-from-the-rave-sandbox-environment) and [live](https://flutterwavedevelopers.readme.io/blog/how-to-get-your-live-keys-from-the-rave-dashboard) | `String` | Required
 | setTxRef(txRef) | This is the unique reference, unique to the particular transaction being carried out. It is generated by the merchant for every transaction | `String` | Required
-| setPhoneNumber(phoneNumber) | This is the customer's phone number. | `String` | Not Required
+| setPhoneNumber(phoneNumber) | This sets the customer's phone number. This functions is also overloaded to allow you specify whether the customer can edit their phone number as such: `setPhoneNumber(phoneNumber,false)`. When set to false, the user will not be able to change the number you set here.| `String`<br/><br/>Optional overloads:<br/>`String`, `boolean` | Not Required
 | acceptAccountPayments(boolean) | Set to `true` if you want to accept payments via bank accounts, else set to `false`. | `boolean` | Not Required
 | acceptCardPayments(boolean) | Set to `true` if you want to accept payments via cards, else set to `false` | `boolean` | Not Required |
 | acceptMpesaPayments(boolean) | Set to `true` if you want to accept Mpesa payments, else set to `false` . For this option to work, you should set your country to `KE` and your currency to `KES` | `boolean` | Not Required |