Add a changelog (#103)

* Add a changelog

* Fix changelog links

* Fix headings

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+### Added
+- Added this changelog.
+
+## [2.0.1] - 2018-11-21
+### Fixed
+- Bugfix related to persistent alert confirm button.
+
+## [2.0.0] - 2018-07-24
+### Added
+- Added method addButton to create new custom buttons.
+- Added method setConfig to customize the configuration "by hand".
+
+### Changed
+- Upgraded to the new sweetalert js api according to THIS migration guide from 1.x to 2.0.
+- Only supports PHP >= 7.0.
+
+## [1.4.3] - 2018-07-24
+### Fixed
+- Minor documentation fixes
+
+## [1.4.2] - 2017-09-11
+### Added
+- Added package discovery for Laravel 5.5
+
+### Fixed
+- Middleware class name type fixed.
+
+## [1.4.1] - 2017-03-27
+### Fixed
+- Fix readme typos
+
+## [1.4.0] - 2016-11-24
+### Added
+- Cancel button config added.
+
+### Changed
+- Documentation improvements.
+
+## [1.3.1] - 2016-11-24
+
+## [1.3.0] - 2016-08-15
+### Added
+- Test suite included.
+- Configuration file included to customize default autoclose timer.
+
+## [1.2.0] - 2016-08-12
+### Added
+- Alert middleware added.
+
+## [1.1.6] - 2016-07-11
+
+## [1.1.5] - 2016-05-29
+
+## [1.1.4] - 2016-03-08
+### Added
+- Added Twig template
+
+## [1.1.3] - 2015-12-22
+### Added
+- Added Html option. This will let sweetalert display html content.
+
+## [1.1.2] - 2015-11-24
+### Fixed
+- Some StyleCI fixes.
+
+## [1.1.1] - 2015-08-04
+### Added
+- Added warning alert message.
+
+## [1.1.0] - 2015-08-02
+### Added
+- Added a method to display an info alert.
+
+### Changed
+- Changed behavior of message and title.
+- Now if title is not specified, the text message will be displayed as the title.
+- Default message now shows a simple alert instead of info.
+
+## [1.0.7] - 2015-07-16
+
+## [1.0.6] - 2015-07-12
+### Fixed
+- Fix included view template
+
+## [1.0.5] - 2015-07-12
+### Fixed
+-Fixed composer.json
+
+## [1.0.4] - 2015-07-12
+### Fixed
+- Fix composer.json
+
+## [1.0.3] - 2015-07-12
+### Fixed
+- Fixed psr-4 autoload
+
+## [1.0.2] - 2015-07-12
+### Changed
+- Improved documentation
+
+## [1.0.0] - 2015-07-12
+
+[Unreleased]: https://github.com/uxweb/sweet-alert/compare/2.0.1...HEAD
+[2.0.1]: https://github.com/uxweb/sweet-alert/compare/2.0.1...2.0.0
+[2.0.0]: https://github.com/uxweb/sweet-alert/compare/1.4.3...2.0.0
+[1.4.3]: https://github.com/uxweb/sweet-alert/compare/1.4.2...1.4.3
+[1.4.2]: https://github.com/uxweb/sweet-alert/compare/1.4.1...1.4.2
+[1.4.1]: https://github.com/uxweb/sweet-alert/compare/1.4.0...1.4.1
+[1.4.0]: https://github.com/uxweb/sweet-alert/compare/1.3.1...1.4.0
+[1.3.1]: https://github.com/uxweb/sweet-alert/compare/1.3.0...1.3.1
+[1.3.0]: https://github.com/uxweb/sweet-alert/compare/1.2.0...1.3.0
+[1.2.0]: https://github.com/uxweb/sweet-alert/compare/1.1.6...1.2.0
+[1.1.6]: https://github.com/uxweb/sweet-alert/compare/1.1.5...1.1.6
+[1.1.5]: https://github.com/uxweb/sweet-alert/compare/1.1.4...1.1.5
+[1.1.4]: https://github.com/uxweb/sweet-alert/compare/1.1.3...1.1.4
+[1.1.3]: https://github.com/uxweb/sweet-alert/compare/1.1.2...1.1.3
+[1.1.2]: https://github.com/uxweb/sweet-alert/compare/1.1.1...1.1.2
+[1.1.1]: https://github.com/uxweb/sweet-alert/compare/1.1.0...1.1.1
+[1.1.0]: https://github.com/uxweb/sweet-alert/compare/1.0.7...1.1.0
+[1.0.7]: https://github.com/uxweb/sweet-alert/compare/1.0.6...1.0.7
+[1.0.6]: https://github.com/uxweb/sweet-alert/compare/1.0.5...1.0.6
+[1.0.5]: https://github.com/uxweb/sweet-alert/compare/1.0.4...1.0.5
+[1.0.4]: https://github.com/uxweb/sweet-alert/compare/1.0.3...1.0.4
+[1.0.3]: https://github.com/uxweb/sweet-alert/compare/1.0.2...1.0.3
+[1.0.2]: https://github.com/uxweb/sweet-alert/compare/1.0.1...1.0.2
+[1.0.1]: https://github.com/uxweb/sweet-alert/compare/1.0.0...1.0.1
+[1.0.0]: https://github.com/uxweb/sweet-alert/releases/tag/1.0.0