Add CHANGELOG.md that follow the https://keepachangelog.com/en/1.0.0/ standard

Author: soerenmartius

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
+- Add `CHANGELOG.md`.
+### Changed
+- Switch CI from SemaphoreCI to GitHub Actions.
+
+## [0.4.1] - 2020-06-04
+### Added
+- Add CONTRIBUTING.md.
+- Add `phony-targets` and `markdown-link-check` hooks.
+### Changelog
+- Update logo and badges in README.md.
+
+## [0.4.0] - 2020-05-28
+### Fixed
+- Fix a bug that was introduced during the last release which forced the
+  re-creation of teams on every run.
+
+## [0.3.1] - 2020-05-24
+### Fixed
+- Fix dependency issue when assigning teams by name.
+
+## [0.3.0] - 2020-05-14
+### Added
+- Add `issue_labels_create` to specify whether you want to force or suppress the
+  creation of issues labels. Default is `true` if `has_issues` is `true` or
+  `issue_labels` is non-empty, otherwise default is `false`.
+
+## [0.2.1] - 2020-05-09
+### Added
+- Introduced support for the
+  [github_repository_webhook](https://www.terraform.io/docs/providers/github/r/repository_webhook.html)
+  resource. You can now add webhooks to your repositories through the newly
+  introduced variable `webhooks`. For further information please read the
+  [documentation](https://github.com/mineiros-io/terraform-github-repository#webhooks-configuration).
+
+## [0.2.0] - 2020-04-16
+### Added
+- Use slugs for team ids.
+### Changed
+- Set `delete_branch_on_merge` default value to `true`.
+- Upgrade terraform-github-provider to `~> 2.6`.
+### Fixed
+- Fix module dependency by introducing `modules_depends_on`.
+
+## [0.1.0] - 2020-02-27
+### Changed
+- Update README.md and add more examples and related tests.
+
+## [0.0.7] - 2020-01-14
+### Changed
+- Breaking Changes for `branch_protection_rules`. Properties are now configured
+  as a nested object instead of lists.
+
+## [0.0.6] - 2020-01-12
+### Changed
+- Ignore changes in `auto_init`.
+- Ignore changes in `gitignore_template`.
+- Ignore changes in `license_template`.
+
+## [0.0.5] - 2020-01-12
+### Added
+- Add `defaults`.
+- Add `extra_topics` for adding additional topics when defaults.topics should
+  not be overwritten but merged.
+- Add `admin_collaborators` as a list of github usernames to add as
+  collaborators with admin permission.
+- Add `push_collaborators` as a list of github usernames to add as collaborators
+  with push permission.
+- Add `pull_collaborators` as a list of github usernames to add as collaborators
+  with pull permission.
+- Add `admin_team_ids` as a list of team IDs to add as admin teams.
+- Add `push_team_ids` as a list of team IDs to add as push teams.
+- Add `pull_team_ids` as a list of team IDs to add as pull teams.
+### Changed
+- Use `for_each` instead of `count` to not recreate most resources when order
+  in module parameter changes.
+- Add automated unit tests.
+### Fixed
+- Fix race condition in `branch_protection` configuration.
+### Removed
+- Remove `teams`.
+- Remove `collaborators`.
+
+## [0.0.4] - 2020-01-06
+### Changed
+- Set `auto_init` default value to `true`.
+
+## [0.0.3] - 2020-01-06
+### Changed
+- Set has_issues default value to `false`.
+
+## [0.0.2] - 2020-01-06
+### Removed
+- Remove unnecessary `Vars` declaration from test.
+### Changed
+- Set `has_feature` toggles default values to `false`.
+- Set example variables default value to null.
+
+## [0.0.1] - 2020-01-05
+### Added
+- This is the initial release of our GitHub Repository module with support for
+  creating and managing GitHub Repositories for Organizations.
+
+[Unreleased]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.4.1...HEAD
+[0.4.1]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.4.0...v0.4.1
+[0.4.0]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.3.1...v0.4.0
+[0.3.1]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.2.1...v0.3.0
+[0.2.1]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.1.0...v0.2.0
+[0.1.0]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.0.7...v0.1.0
+[0.0.7]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.0.6...v0.0.7
+[0.0.6]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.0.5...v0.0.6
+[0.0.5]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.0.4...v0.0.5
+[0.0.4]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.0.3...v0.0.4
+[0.0.3]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.0.2...v0.0.3
+[0.0.2]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.0.1...v0.0.2
+[0.0.1]: https://github.com/mineiros-io/terraform-aws-s3-bucket/releases/tag/v0.0.1