Update CHANGELOG for v1.7.0 (#163)

* Update CFN Specification

* Update CHANGELOG.md

CHANGELOG.md

@@ -6,12 +6,15 @@ and this project adheres to [Semantic
 Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [1.7.0] - 2018-05-06
 ### Fixed
 - Merge PR #155, fixing GetAtt not throwing errors on invalid resource
 
 ### Changed
 - Merge PR #157, adding licence attribute to package.json
 - Merge PR #148, removing cloudformation-js-yaml-schema in favour of custom handling of intrinsic functions
+- Update CloudFormation specification (downloaded 06-May-2018) - version: 2.1.0
 - Merge PR #159, improving readability of README.md
 
 ### Added
@@ -133,7 +136,8 @@ Versioning](http://semver.org/spec/v2.0.0.html).
 ### Added
 - Add pseudo parameter support
 
-[Unreleased]: https://github.com/martysweet/cfn-lint/compare/v1.6.2...HEAD
+[Unreleased]: https://github.com/martysweet/cfn-lint/compare/v1.7.0...HEAD
+[1.7.0]: https://github.com/martysweet/cfn-lint/compare/v1.6.2...v1.7.0
 [1.6.2]: https://github.com/martysweet/cfn-lint/compare/v1.6.1...v1.6.2
 [1.6.1]: https://github.com/martysweet/cfn-lint/compare/v1.6.0...v1.6.1
 [1.6.0]: https://github.com/martysweet/cfn-lint/compare/v1.5.1...v1.6.0