Update README with new python and botocore requirements (ansible-coll…

…ections#369)

Update README with new python and botocore requirements

Reviewed-by: https://github.com/apps/ansible-zuul

README.md

@@ -15,7 +15,11 @@ PEP440 is the schema used to describe the versions of Ansible.
 
 ## Python version compatibility
 
-This collection depends on the AWS SDK for Python (Boto3 and Botocore). As AWS has [ceased supporting Python 2.6](https://aws.amazon.com/blogs/developer/deprecation-of-python-2-6-and-python-3-3-in-botocore-boto3-and-the-aws-cli/), this collection requires Python 2.7 or greater.
+As the AWS SDK for Python (Boto3 and Botocore) has [ceased supporting Python 2.7](https://aws.amazon.com/blogs/developer/announcing-end-of-support-for-python-2-7-in-aws-sdk-for-python-and-aws-cli-v1/), this collection requires Python 3.6 or greater.
+
+Starting with the 2.0.0 releases of amazon.aws and community.aws, it is generally the collection's policy to support the versions of `botocore` and `boto3` that were released 12 months prior to the most recent major collection release, following semantic versioning (for example, 2.0.0, 3.0.0).
+
+Version 2.0.0 of this collection supports `boto3 >= 1.13.0` and `botocore >= 1.16.0`
 
 ## Included content