(feat): keep a changelog

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]
+
+## [v1.0.0] - 2021-07-31
+
+### Added
+- This CHANGELOG file to hopefully serve as an evolving example of a
+  standardized open source project CHANGELOG.
+- Golang CLI using [cobra](https://github.com/spf13/cobra)
+- goreleaser config to help release versions of the cli
+- github action to release new tags through goreleaser
+- README explaining how to install and use the cli
+
+[Unreleased]: https://github.com/lucassabreu/gh-collab-manager/compare/v1.0.0...HEAD
+[v1.0.0]: https://github.com/lucassabreu/gh-collab-manager/releases/tag/v1.0.0