Moving the CHANGELOG to a semver format (#38)

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/) 
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+### Added
+- Add the support for Debian 8 in the metadata.json to be able to find the
+  module more easily while filtering in the forge.
+- Add the support for SwiftPublishEndpoints.
+- The package xz-utils is now managed by the module.
+
+### Changed
+- Change the default aptly port to avoid having troubles with the aptly user
+  unable to bind ports under 1024. This change is the cause of this version
+  to be a major version and not a minor version.
+- Move the current changelog to a semver format.
+- Several indentation, lint and rubocop cleanups have been integrated.
+- The Travis tests matrix has been changed to speed up the tests and focus on
+  the most important environments.
+- The documentation received some fixes and additions.
+
+### Fixed
+- Fix a syntax issue in the init script preventing, in some configurations, the
+  aptly service from starting.
+- Fix the recurse permissions on the root directory of aptly.
+- Fix permissions on init script to make it executables not only by root.
+- Fix the integers validation for the ports.
+- Better handling of the exists? function in the providers, plus getting it
+  uniform. There were some issues with that were leading to the recreation of
+  the resources every time you run puppet.
+- When running aptly as a non-root user, the cli was generating files that the
+  aptly user could not read, causing troubles.  Those permissions are now
+  managed by Puppet.
+
+### Dropped
+- Drop the support of the CONTRIBUTORS file as it was maintained manually
+  and can anyway be checked in the git logs or via the github api.
+
+
+## [2.1.0] - 2016-08-22
+### Added
+- Adding aptly_repo type and provider and aptly::repo define and add
+  documentation for them.
+- Adding the params class to the specs
+
+### Fixed
+- Fixing exist? function for publish and repo providers
+
+## [2.0.2] - 2016-08-22
+### Added
+- Adding an example of how to create a mirror
+
+### Fixed
+- Fixing issues with broken providers
+- Fixing "WARNING: quoted boolean value found"
+
+## [2.0.1] - 2016-08-17
+### Fixed
+- Forcing the -config parameter on the aptly service to ensure the right config
+  is taken
+- Fixing the declaration of the no-lock flag in the aptly-api service making the
+  API not start when no-lock was enable
+- Fix some issues in the documentation
+
+## [2.0.0] - 2016-08-04
+### Added
+- Adding documentation
+- Adding the possiblity of setting up mirrors, snapshots and publications
+  directly via puppet
+- Adding the management of the API
+
+### Changed
+- The following parameters have been renamed for a better coherence:
+ * aptly::rootDir => aptly::root_dir (was already available with this name in hiera),
+ * aptly::config_arch => aptly::architectures (was already available with this name in hiera),
+ * aptly::config_props => aptly::properties (was already available with this name in hiera),
+ * aptly::s3publishpson => aptly::s3_publish_endpoints (was available under aptly::s3PublishEndpoints in hiera before)
+
+## [1.0.2] - 2015-07-03
+### Added
+- Adding CI public tools integration
+
+### Changed
+- Cleaning up the different supported versions
+- Updating the dependecies list in metdata.json
+
+###Removed
+- Dropping the support for version 2.7 as not supported by the dependencies
+  (puppetlabs/apt module)
+
+## [1.0.1] - 2015-06-06
+### Changed
+- Cleanup code quality warnings
+
+## [1.0.0] - 2015-06-05
+### Added
+- Initial public release