Preparing release v1.6.0 (#223)

Author: abhinav

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [1.6.0] - 2018-11-06
 ### Changed
 - When an error graph is visualized, the graph is pruned so that the graph only
   contains failure nodes.
@@ -138,7 +138,7 @@ First release candidate.
 
 Initial release.
 
-[Unreleased]: https://github.com/uber-go/dig/compare/v1.5.1...HEAD
+[1.6.0]: https://github.com/uber-go/dig/compare/v1.5.1...v1.6.0
 [1.5.1]: https://github.com/uber-go/dig/compare/v1.5.0...v1.5.1
 [1.5.0]: https://github.com/uber-go/dig/compare/v1.4.0...v1.5.0
 [1.4.0]: https://github.com/uber-go/dig/compare/v1.3.0...v1.4.0