Added a changelog to track future releases

CHANGELOG.md

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+# Changelog
+All notable changes to `tweetkit` 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).
+
+## [0.1.5] - 2022-01-09
+### Added
+- Added the ability to add OAuth tokens when setting up the client instance. Credit to @rofreg
+- Added OAuth as an option to authenticate requests. Credit to @rofreg
+- Added the `post_tweet` method to post tweets via OAuth. Credit to @rofreg
+- Added the `delete_tweet` method to delete tweets via OAuth. Credit to @rofreg
+- Added tests for the `Tweets` module.
+- Added tests for the `Search` module.
+- Added tests for search building and cleaning in the `Conjunctions` class.
+### Changed
+- Updated client responses to return a `Tweetkit::Response` object. The `Tweetkit::Response` object contains a `Tweets` object that is made up of `Tweet` objects that contain the data for each respective tweet. `Fields` and `Expansions` objects are also available depending on the fields and expansions made in the request.
+- Moved search building and cleaning logic to the `Conjunctions` class.
+- Fixed wrong config key names when setting up the client. Credit to @dewey
+### Removed
+- No changes