Added a changelog for v1.2.0

Author: JamesMessinger

CHANGELOG.md

@@ -0,0 +1,15 @@
+Change Log
+=======================================
+All notable changes will be documented in this file.
+`host-environment` adheres to [Semantic Versioning](http://semver.org/).
+
+
+[v1.2.0](https://github.com/JS-DevTools/ono/tree/v1.2.0) (2020-02-10)
+----------------------------------------------------------------------------------------------------
+
+### New Features
+
+- Added a new [`host.ci` property](README.md#hostci), which provides information about the CI/CD host that the code is running in.
+
+
+[Full Changelog](https://github.com/JS-DevTools/ono/compare/v1.1.4...v1.2.0)