Add in changelog.

CHANGELOG.md

+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+
+## [publish_1.0.4 ] - 2019-05-15
+### Fixed
+- Retitled documentation for skipDiff and skipMotif to be more clear
+- Add missing python module for motif search
+- Updated links for phantompeaktools and references
+- Fix callPeaks for single control experiments
+
+## [publish_1.0.3 ] - 2019-04-23
+### Fixed
+- Variable name for design file for Astrocyte
+- File path for design file to work for Astrocyte
+
+## [publish_1.0.0 ] - 2019-04-23
+Initial release of pipeline