fix compare links in changelog

Author: tylerflex

CHANGELOG.md

@@ -390,13 +390,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - A large number of small improvements and bug fixes.
 
 [Unreleased]: https://github.com/flexcompute/tidy3d/compare/v1.6.0...develop
-[1.6.0]: https://github.com/flexcompute/tidy3d/compare/v1.5.0...1.6.0
-[1.5.0]: https://github.com/flexcompute/tidy3d/compare/v1.4.1...1.5.0
-[1.4.1]: https://github.com/flexcompute/tidy3d/compare/v1.4.0...1.4.1
-[1.4.0]: https://github.com/flexcompute/tidy3d/compare/v1.3.3...1.4.0
-[1.3.3]: https://github.com/flexcompute/tidy3d/compare/v1.3.2...1.3.3
-[1.3.2]: https://github.com/flexcompute/tidy3d/compare/v1.3.1...1.3.2
-[1.3.1]: https://github.com/flexcompute/tidy3d/compare/v1.3.0...1.3.1
+[1.6.0]: https://github.com/flexcompute/tidy3d/compare/v1.5.0...v1.6.0
+[1.5.0]: https://github.com/flexcompute/tidy3d/compare/v1.4.1...v1.5.0
+[1.4.1]: https://github.com/flexcompute/tidy3d/compare/v1.4.0...v1.4.1
+[1.4.0]: https://github.com/flexcompute/tidy3d/compare/v1.3.3...v1.4.0
+[1.3.3]: https://github.com/flexcompute/tidy3d/compare/v1.3.2...v1.3.3
+[1.3.2]: https://github.com/flexcompute/tidy3d/compare/v1.3.1...v1.3.2
+[1.3.1]: https://github.com/flexcompute/tidy3d/compare/v1.3.0...v1.3.1
 [1.3.0]: https://github.com/flexcompute/tidy3d/compare/v1.2.2...v1.3.0
 [1.2.2]: https://github.com/flexcompute/tidy3d/compare/v1.2.1...v1.2.2
 [1.2.1]: https://github.com/flexcompute/tidy3d/compare/v1.2.0...v1.2.1