Merge pull request aws-cloudformation#662 from ericzbeard/awscli-modules

This PR makes significant changes to the functionality for modules, making Rain compatible with a draft PR that is in progress for the AWS CLI `cloudformation package` command.

Update .pre-commit-hooks.yaml to use rain instead of cfn-format

 v1.21.0-fix-653

Merge pull request aws-cloudformation#628 from ericzbeard/v-1-21-0

Version bump

Merge pull request aws-cloudformation#619 from ericzbeard/v-1-20-2

Version 1.20.2

Merge pull request aws-cloudformation#618 from ericzbeard/v-1-20-1

Fixing incorrect schema

Merge pull request aws-cloudformation#613 from ericzbeard/v-1-20-0

Schema updates for version bump

Merge pull request aws-cloudformation#579 from ericzbeard/v-1-19-0

Version bump to v1.19.0

Merge pull request aws-cloudformation#566 from ericzbeard/bootstrap

Add expected bucket owner checks to s3 operations

Merge pull request aws-cloudformation#563 from ericzbeard/v-1-17-0

Release 1.17.0