README Step 7's Bucket ID is confusing

[Mauville]

I got stuck for a while on the install process 7th step because I added my AWS account ID using dashes, as the readme indicates.

However, it was not until I removed them that I managed to properly write to the bucket. This was thanks to an AWS docs that defines the same policy, but without the dashes in the placeholder.

https://docs.aws.amazon.com/ses/latest/DeveloperGuide/receiving-email-permissions.html

Renaming the placeholder from AWS-ID-NUMBER to AWSIDNUMBER should clear future misunderstandings.

[Mauville]

Perhaps it was just me being new at AWS, but I completely forgot that the bucket, the script and the SES instance must be in a region supported by SES. README would benefit from saying that