Updates to readme

[greenozon]

Minor ticket to actualize readme page

current readme states:

Set AWS provider's region to us-east-1 or sa-east-1 when using [modules/pricing](https://github.com/terraform-aws-modules/terraform-aws-pricing/tree/master/modules/pricing) because AWS Pricing service is only available in these regions.

1. there is no region as sa-east-1 as stated in the readme
   I believe this should be ap-south-1

2. current list of AWS regions that supports pricing querying is as follows:

▶ $ aws pricing describe-services --region us-east-1
▶ $ aws pricing describe-services --region eu-central-1
▶ $ aws pricing describe-services --region ap-south-1

it means +1 new region: eu-central-1

The idea is to update readme and make it up-to-date

thanks

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[greenozon]

hi @antonbabenko hwdy!
any chance to review above micro PR please?

Glory to Ukraine!

[github-actions]

This issue has been automatically marked as stale because it has been open 30 days
with no activity. Remove stale label or comment or this issue will be closed in 10 days

[greenozon]

@antonbabenko are you available to review this minor change please?

[antonbabenko]

Thanks, @greenozon !

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