Prepare release v1.4.0 (#113)

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]
+## [1.4.0] - 2019-11-19
 ### Changed
 - Migrate to Go modules.
 
@@ -94,7 +94,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Removed
 - Trim `Provider` interface down to just `Name` and `Get`.
 
-[Unreleased]: https://github.com/uber-go/config/compare/v1.3.1...HEAD
+[1.4.0]: https://github.com/uber-go/config/compare/v1.3.1...v1.4.0
 [1.3.1]: https://github.com/uber-go/config/compare/v1.3.0...v1.3.1
 [1.3.0]: https://github.com/uber-go/config/compare/v1.2.2...v1.3.0
 [1.2.2]: https://github.com/uber-go/config/compare/v1.2.1...v1.2.2

version.go

@@ -21,4 +21,4 @@
 package config // import "go.uber.org/config"
 
 // Version is the current semantic version.
-const Version = "1.3.1"
+const Version = "1.4.0"