Cfn-lint

Features
- Add rule [E3030](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3030) to use the newly patched spec to check resource properties values. Update the following rules replaced by [E3030](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3030).
- Delete rule [W2512](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#W2512)
- Delete rule [E2531](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2531)
- Move allowed values check in rule [E2505](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2505)
- Add rule [E3008](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3008) to use the newly patched spec to check a resource properties Ref and GetAtt. Update the following rules replaced by [E3008](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3008).
- Delete rule [E2502](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2502)
- Delete rule [W2505](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#W2505)
- Improve rule [E3020](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3020) to check MX records
CloudFormation Specifications
- Update CloudFormation specs to 2.18.1
- Append the CloudFormation spec to include:
- AllowedValues for resource properties
- Allowed Ref/GetAtts for resource properties
- Add specs for regions `eu-north-1`, `us-gov-east-1`, `us-gov-west-1`
- Add `AWS::StepFunctions::StateMachine` in all supported regions
- Add `AWS::CloudWatch::Alarm.Metric`, `AWS::CloudWatch::Alarm.MetricDataQuery` and `AWS::CloudWatch::Alarm.MetricStat` in all supported regions
- Add `AWS::Lambda::LayerVersion`, `AWS::Lambda::LayerVersion.Content`, and `AWS::Lambda::LayerVersionPermission` in all supported regions
Fixes
- Fix description on rule [W2501](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#W2501) to be more informative
- Update rule [E2532](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2532) to allow `Parameters` in a `Task` in a Step Function
- Fix rule [E1010](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E1010) to allow Refs in the GetAtt attribute section
- Add `AWS::CloudFormation::Init` as an exception for rule E1029
- Add `Informational` error messages to JSON outputs
- Fix file searching `**/*` to recursively search in Python 3.5 and greater
- Update CopyRight from 2018 to 2019

Features
- Code coverage testing integrated into the CI process
- Update CloudFormation specs to 2.18.0
Fixes
- Fix rule [E2505](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2505) to allow for SSM parameters when checking Cidr and Tenancy parameters
- Fix rule [E1029](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E1029) to not error on API Gateway stageVariables

Features
- Support stdin for reading and testing templates
Fixes
- Remove dependency on regex package as it requires gcc
- Remove rule [E3507](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3507) because it depends on regex package

Features
- Update specs to version 2.16.0
Fixes
- Require pathlib2 in Python versions earlier than 3.4.0
- Update aws-sam-translator to v1.8.0
- Update requests dependency to be at least version 2.15.0
- Add Python 3.7 support for Lambda
- Provide valid Python runtimes in rule [E2531](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2531) error message
- Allow Fn::Sub inside a Fn::Sub for rule [E1019](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E1019)
- Add hardcoded list check as invalid in rule [E6003](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E6003)
- Fix home expansion with when looking for .cfnlintrc in Python 3.4
- Add testing in Travis for Py34, Py35, Py37
- Prevent spaces after the comma in spec file
- Update allowed Lambda Runtimes to include provided and ruby

Features
- Update specs to version 2.15.0
Fixes
- Fix rule [E3020](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3020) to allow multiple text records of up to 255 characters
- Fix rule [E3016](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3016) to handle conditions in Update Policies
- Fix rule [E2532](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2532) to not fail when using a Fn::Sub and a number for a param

Features
- Add support for eu-west-3 and ap-northeast-3
- Add Resource Type AWS::CloudFormation::Macro to CloudFormation Spec
Fixes
- Fix the error message for YAML null being off by 1 line and 1 column number
- Add Custom Error for when trying to access an attribute in the classes that make up the template
- Fix an issue with deepcopy not creating copies with start and end marks
- Fix 4 rules that would fail when trying to create the path of the error and running into an integer
- Fix rule [E2015](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2015) to force parameter default values to be a string when testing against the AllowedPattern regex pattern
- Fix a bug in the config engine in which append rules would have gone to override spec
- Remove exit calls from functions that are used in integrations preventing pre-mature failures
- Fix rule [E3002](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3002) [E3003](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3003) to support functions that may be able to support objects