Add changelog

Author: greenled

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]
+
+## [0.1.0] - 2019-05-24
+### Added
+- Stack deployment
+- Stack update
+- Stack undeployment
+- Configuration through environment variables
+- Configuration through flags
+- Stack environment variables loading from file
+- Optional SSL verification of Portainer instance
+- Verbose mode
+- Debug mode
+- Strict mode
+
+[Unreleased]: https://github.com/greenled/portainer-stack-utils/compare/0.1.0...HEAD
+[0.1.0]: https://github.com/greenled/portainer-stack-utils/releases/tag/0.1.0