chore: Create initial release changelog

Author: orestes

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).
+
+## [v1.0.0-beta] - 2020-05-02
+
+### Added
+
+- GitHub Stars
+- GitHub Forks
+- GitHub Releases
+- GitHub Issues Opened
+- GitHub Issues Assigned
+- GitHub Pull Requests Opened
+- GitHub Pull Requests Merged
+- GitLab Merge Request Opened
+- GitLab Merge Request Merged