Features
- Update CloudFormation specs to July 16th, 2018
- Support comma lists for regions, append rules, and ignore check parameters
- Added documentation explaining Resource Specification based rules
Fixes
- Fix a bunch of typos across many different rules
- Support DeepCopy with Template and custom String classes used for marking up templates
- Fix Rule [E3002](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3002) to support CommaDelimitedList when looking for List Parameters
- Fix core engine to check that something is a Dict instead of assuming it is