Add CHANGELOG

Signed-off-by: Thomas A. Christensen II <25492070+MillironX@users.noreply.github.com>

CHANGELOG.md

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+# Changelog
+
+All notable changes to Cowsay.jl 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
+
+## [v0.2.0] - 2021-11-29
+
+### Added
+
+- Unit testing via `jldoctest`
+- Ability to customize cow art
+- Ability to customize cow eyes
+- Ability to customize cow tongue
+- New cow artwork
+  - blowfish
+  - bunny
+  - cower
+  - dragon_and_cow
+  - dragon
+  - elephant_in_snake
+  - elephant
+  - eyes
+  - flaming_sheep
+  - fox
+  - kitty
+  - koala
+  - mech_and_cow
+  - meow
+  - moofasa
+  - moose
+  - mutilated
+  - sheep
+  - skeleton
+  - small
+  - stegosaurus
+  - supermilker
+  - surgery
+  - three_eyes
+  - turkey
+  - turtle
+  - tux
+  - udder
+  - vader_koala
+  - vader
+  - www
+
+### Changed
+
+- Default cow abstracted to `Cowsay.default` function
+
+## [v0.1.0] - 2021-09-23 (Unregistered)
+
+### Added
+
+- `cowsay` function for Julia in package format
+
+[Unreleased]: https://github.com/MillironX/Cowsay.jl/compare/v0.2.0...HEAD
+[v0.2.0]: https://github.com/MillironX/Cowsay.jl/compare/v0.1.0...v0.2.0
+[v0.1.0]: https://github.com/MillironX/Cowsay.jl/releases/tag/v0.1.0