adding CHANGELOG.md to project

CHANGELOG.md

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+# Petrified Changelog
+
+Project Home: https://github.com/troyengel/petrified
+
+## [2.0.1] - 2017-11-19
+- Add `CHANGELOG.md` to project
+- Update README / man for new systemd things
+- Rebuild systemd again to use timers.target (#4)
+  - Remove petrified.target design completely
+  - Instanced units can be created manually using systemd overrides
+- Use templates to build systemd units ExexStart path (#4)
+  - Unit files to install are now templates built by Makefile
+  - Path is determined by `PREFIX=` semantics (packaging standard)
+
+## [2.0.0] - 2017-11-19
+- Implement FreeDNS APIv2 alongside APIv1 with dynamic API guess (#5)
+  - Default config is to guess which API based on key length
+  - Specific API version can be coded into config, see `DDNS_API`
+  - See comments in `petrified.conf` for details on new settings
+- Add new `LOG_QUIET` option to not emit if IP hasn't changed (#4)
+- Update shebang to be BSD portable (bin/bash -> bin/env bash)
+
+## [1.0.6] - 2016-01-24
+- Rebuild systemd design for timers and target (#3)
+- Fix systemd `OnCalendar` implementation
+- Add systemd `OnActiveSec` to timer on startup
+- Deprecate Arch build - AUR started using git
+- Update / enhance docs and man page
+
+## [1.0.5] - 2015-03-08
+- Fix bad perlpod char
+- Add cleanup routine to bad IP exit clause
+- Update / enhance Makefile
+
+## [1.0.4] - 2014-12-01
+- Fix bad month macro in logfile entries (@IanMReed)
+
+## [1.0.3] - 2014-01-24
+- Add Makefile to project
+- Convert `README.md` to `README.pod` for multi-use
+- Add petrified.1 man page built from README.pod
+- Update / enhance Arch `PKGBUILD` things
+- Change logrotate to not install systemwide
+
+## [1.0.2] - 2014-11-22
+- Documentation updates and enhancements
+- First addition of systemd timers (#1)
+- Reorganize file layout (move things to subdirs)
+- Add better examples for (f)cron, logrotate, etc.
+- Add security / permissions check of config file
+  - Contains API key, should be kept protected
+
+## [1.0.1] - 2014-09-07
+- First release of working version
+- First tagged release for packagers
+
+## [1.0.0] - unreleased / untagged
+- First commits to build project
+