CHANGELOG.md: initial commit

Add initial changelog for standalone Terraform provider.

Signed-off-by: Mateusz Gozdek <mgozdekof@gmail.com>

Author: invidian

CHANGELOG.md

@@ -0,0 +1,18 @@
+# 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).
+
+## [0.4.0] - 2020-08-31
+
+### Added
+
+- Initial release based on [libflexkube v0.4.0](https://github.com/flexkube/libflexkube/releases/tag/v0.4.0).
+
+### Changed
+
+- flexkube_containers: rename 'container' to 'host_configured_container'.
+
+[0.4.0]: https://github.com/flexkube/terraform-provider-flexkube/releases/tag/v0.4.0