Create CHANGELOG.md

Author: mmallis87

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+See [DocuSign Support Center](https://support.docusign.com/en/releasenotes/) for Product Release Notes.
+
+## [Unreleased]
+### Added
+- More test cases.
+
+### Changed
+- Updated the package with the latest API release.
+
+## [2.1.0] - 2017-01-24
+### Added
+- Documentation about several Authentication methods supported by DocuSign API.
+
+### Changed
+- Support for DocuSign Core release 16.1.00.00.
+- Code snippet to use base URL from the login call. Required for integrations when they go live.
+
+### Fixed
+- Issue [`#47`](https://github.com/docusign/DocuSign-Node-Client/issues/47): Some DocuSign API calls don't like null as object property value.
+
+## [2.0.3] - 2016-03-23
+### Added
+- TravisCI automatic testing.
+
+### Changed
+- Updated the package to a newer API release.
+- Switched to MIT license.
+- Updated documentation on README.