docs: adds CHANGELOG entry for #15 and prepares 1.1.4 release

Author: weierophinney

CHANGELOG.md

@@ -2,6 +2,28 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
+## 1.1.4 - 2020-02-05
+
+### Added
+
+- Nothing.
+
+### Changed
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- [#15](https://github.com/php-fig/http-message-util/pull/15) removes the dependency on psr/http-message, as it is not technically necessary for usage of this package.
+
+### Fixed
+
+- Nothing.
+
 ## 1.1.3 - 2018-11-19
 
 ### Added