Add 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).
+
+## [1.0.1] - 2021-07-21
+
+### Added
+
+- More information to the PyPI meta information, e.g., classifiers, readme, some URLs.
+
+### Changed
+
+- Moved the License Type parameter from the Cdm constructor to `get_license_challenge()`.
+- The Session ID is no longer used as the Request ID which could help with blocks or replay checks due
+  to it being the same Session ID for each request. It's now a random 16 byte value each time.
+- Only the Context Data of each license request is now stored instead of the full message.
+
+### Removed
+
+- Removed unnecessary and unused `raw` Cdm class instance variable.
+
+### Fixed
+
+- Cdm's `set_service_certificate()` now correctly raises a DecodeError on Decode Error instead of a ValueError.
+- Context Data will now always match to their corresponding License Responses. This fixes an issue where creating
+  a second challenge would overwrite the context data of the first challenge. Parsing the first challenge after
+  would result in either a key decrypt error, or garbage key data.
+
+## [1.0.0] - 2021-07-20
+
+Initial Release.
+
+[1.0.1]: https://github.com/rlaphoenix/pywidevine/releases/tag/v1.0.1
+[1.0.0]: https://github.com/rlaphoenix/pywidevine/releases/tag/v1.0.0