fix: Added tflint and fixes in README

[xiaohanxu-nick]

Description

fix some typos in README

Motivation and Context

To make the document more informational and helpful

Breaking Changes

No

How Has This Been Tested?

I have checked the generated README file.

[antonbabenko]

Thanks, @Xiaohanxu1996 !

As you can see I added a few other things to your PR.

v2.19.0 has been just released.

[xiaohanxu-nick]

Thanks, XD

[aduewel]

@antonbabenko @Xiaohanxu1996 why were the aws provider version spec reverted?

[bryantbiggs]

hi @aduewel - I'm not sure what you mean by provider version spec reverted but this is what the current version specifications are as of today https://github.com/terraform-aws-modules/terraform-aws-rds/blob/master/versions.tf

[aduewel]

@bryantbiggs sorry for the confusion ... I overlooked the >= (greater than) ... sorry

[github-actions]

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