Add a changelog and rewrite license in markdown

CHANGELOG.md

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+# Changelog for SSDcronTRIM
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/).
+
+As of version 2.0.0 this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+### Added
+- Added a proper changelog according to [Keep a Changelog](http://keepachangelog.com/).
+- Added a [Makefile](Makefile) for easy (un)installation.
+
+### Changed
+- Separated man page, cron jobs, and main script.
+
+## [1.06] - 2017-07-24
+### Fixed
+- Fixed a typo `` `$BASENAME $0` [-d|--deinsall]`` --> `` `$BASENAME $0` [-d|--deinstall]``.
+- Hardcode cronjob permissions to 740, as using `--reference` had problems renewing the cronjob.
+
+## [1.05] - 2016-06-08
+### Fixed
+- Fixed cronjob permissions, as `mktemp` made them `0600`. Thanks to [Christian Dysthe](https://github.com/cdysthe) for bringing this to my attention!
+
+## [1.04] - 2016-02-26
+### Fixed
+- Fixed insecure usage of temporary files. Thanks to [carnil](https://github.com/carnil) for pointing this out!
+- Fixed `find_tool` function not exiting, which led to strange output.
+
+### Added
+- Added a changelog to the script.
+
+## [1.03] - 2015-05-03
+### Fixed
+- Work on kernels >= 3 rather than = 3.
+
+## [1.02] - 2014-03-28
+### Fixed
+- Fixed a typo that prevented trimming between 50% and 59% usage. Thanks goes to Diego Coste.
+
+## [1.01] - 2014-03-21
+### Fixed
+- Fixed missing whitespace in some `if` statements. Found by mastropos.
+
+## [1.00] - 2014-02-22
+### Initial release.