Added changelog

Author: JamesMessinger

CHANGELOG.md

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+# Change Log
+All notable changes will be documented in this file.
+Chai-Exec adheres to [Semantic Versioning](http://semver.org/).
+
+
+## [v1.1.0](https://github.com/JS-DevTools/chai-exec/tree/v1.1.0) (2018-12-23)
+
+- Added a [`chaiExec.defaults`](README.md#chaiexecdefaults) property, which can reduce repetition in your tests by only setting the `command`, `args`, and/or `options` _once_.
+
+[Full Changelog](https://github.com/JS-DevTools/chai-exec/compare/v1.0.0...v1.1.0)