README questions/changes

[dylmye]

Hi! Thanks for writing this package. I haven't used Serverless before. I think it would be useful to have a prerequisites list in the README. Something like the below:

• Serverless CLI v1
• Monzo OAuth Client
• Yarn

and maybe some of the obvious like a Monzo account (does the Monzo API work for Monzo USA accounts? If not it would be good to specify).

Also I don't see what the point of step 2 in your current list is, because we don't do anything with the monzo account ID?

Thank you :)

[dylmye]

Also I tried to run the following command after yarn global add serverless@1:

$env:LUNCHMONEY_ASSET_ID=XXX;$env:LUNCHMONEY_TOKEN=XXX;$env:MONZO_CLIENT_ID=XXX;$env:MONZO_CLIENT_SECRET=XXX; serverless deploy --org=FOOBAR --stage production --region eu-west-2

And I get the following error back:

Error: Profile sub_account does not exist
      at Object.addProfileCredentials (C:\Users\XXX\AppData\Local\Yarn\Data\global\node_modules\serverless\lib\plugins\aws\provider\awsProvider.js:106:15)
      at AwsProvider.getCredentials (C:\Users\XXX\AppData\Local\Yarn\Data\global\node_modules\serverless\lib\plugins\aws\provider\awsProvider.js:667:12)

Let me know if I can provide any details to help