Add a changelog

CHANGELOG.md

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+# Changelog
+
+## [0.1.1] - 2015-12-18
+
+### Added:
+- CLI: Added a way to automate renewal through a cronjob using the --days parameter to renew
+
+### Changed:
+- lib: Improved log output on challenge failures.
+
+### Fixed:
+- CLI: The short parameter for domains would not get accepted
+- CLI: The cli did not return proper exit codes on error library errors.
+- lib: RenewCertificate did not properly renew SAN certificates.
+
+### Security
+- lib: Fix possible DOS on GetOCSPForCert
+
+## [0.1.0] - 2015-12-03
+- Initial release