Add CHANGELOG

CHANGELOG.md

+# Changelog
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+
+## [1.0.0] - 11th feb 2020
+### Added
+- RAPIDRUN reference sequences generation 
+
+### Changed
+- add mitofish sequences option is now disabled by default (parameters "n")
+
+### Removed
+- mitofish files
+