Features
- Add `--build-graph` parameter to create a graph of dependencies (pull [1411](https://github.com/aws-cloudformation/cfn-python-lint/pull/1411))
CloudFormation Specifications
- Update CloudFormation specs to 12.1.0 (pull [1455](https://github.com/aws-cloudformation/cfn-python-lint/pull/1455))
Fixes
- Add `found unknown escape character` to start of err problem to determine when to use json parsing (pull [1454](https://github.com/aws-cloudformation/cfn-python-lint/pull/1454))