Update references from Login to Reset token

The instructions in the README still referred to the old `ChatGPT:
Login` command which no longer exists instead of the new `ChatGPT: Reset
token` command.

README.md

@@ -23,7 +23,7 @@ The `README.md` file for this extension was generated by ChatGPT.
 
 To use the extension:
 **This package requires a valid session token from ChatGPT to access it's unofficial REST API.**
-Open the VS Code Command Palette and Type `ChatGPT: Login`, this will prompt you for your session token.
+Open the VS Code Command Palette and Type `ChatGPT: Reset token`, this will prompt you for your session token.
 
 To get a session token:
 
@@ -33,7 +33,7 @@ To get a session token:
 
  ![image](https://user-images.githubusercontent.com/38425102/205900045-185c2c41-b4ff-408c-9da6-bbb606ac39c6.png)
 
-4. Copy the value for `__Secure-next-auth.session-token` and enter it into the prompt from `ChatGPT: Login`
+4. Copy the value for `__Secure-next-auth.session-token` and enter it into the prompt from `ChatGPT: Reset token`
 
 *Once you're logged in, you can ask ChatGPT any question and supply source code from your current file/selection.*