Add changelog.

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.  The format is based on [Keep a Changelog][kacl], and this project adheres to [Semantic Versioning][semver].
+
+  [kacl]: https://keepachangelog.com/en/1.0.0/
+  [semver]: https://semver.org/spec/v2.0.0.html
+
+
+## Unreleased
+
+
+## 0.1.4
+
+*2019-08-12*
+
+- Added: Citation instructions and release DOIs via GitHub/Zenodo.
+- Added: This changelog file.
+
+
+## 0.1.3
+
+*2019-08-02*
+
+- Added: Python3 compatibility by Thomas Holder ([@speleo3][]).
+- Added: Instructions for symlinking to Phenix-installed Reduce and Probe.
+- Changed: Installation instructions to use Github master zip file by default.
+- Fixed: Several bugs related to Tk interface, by Thomas Holder ([@speleo3][]).
+- Removed: `make` targets "updateenv" and "run".
+
+
+## 0.1.2
+
+*2017-01-13*
+
+- Fixed: Parsing of Flipkin output for some atoms ("invalid literal for float" error).
+
+## 0.1.1
+
+*2017-01-10*
+
+- Changed: Redirect some low-level output to logger instead of console.
+- Fixed: Provide a more informative error message when required executables are not found in PATH.
+- Fixed: An error that occurred when trying to load a non-existant object.
+
+
+## 0.1.0
+
+*2016-10-26*
+
+- Initial release
+
+
+<!-- Contributor GitHub Profile Links -->
+  [@speleo3]: https://github.com/speleo3