Add a CHANGELOG.md file to track schema changes.

CHANGELOG.md

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+# Changelog
+All notable schema changes for this project will be documented in this file. Changes to the data, e.g. adding feature support, will _not_ be documented here.
+
+The format is loosely based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [Unreleased]
+
+## [0.0.48] - 2018-08-23
+No schema changes.
+
+## [0.0.47] - 2018-08-16
+No schema changes.
+
+## [0.0.46] - 2018-08-09
+No schema changes.
+
+## [0.0.45] - 2018-08-02
+### Changed
+- Standardize bugzilla bug link format. ([#2511])
+
+## [0.0.44] - 2018-07-26
+No schema changes.
+
+## [0.0.43] - 2018-07-19
+### Changed
+- Require `status` block for all data categories except `webextensions`. ([#2382])
+
+## [0.0.42] - 2018-07-12
+No schema changes.
+
+## [0.0.41] - 2018-07-10
+No schema changes.
+
+## [0.0.40] - 2018-06-28
+### Changed
+- Standardize worker support info with the subfeature name `worker_support`. ([#2362])
+
+## [0.0.39] - 2018-06-21
+No schema changes.
+
+## [0.0.38] - 2018-06-07
+No schema changes.
+
+## [0.0.37] - 2018-05-31
+No schema changes.
+
+## [0.0.36] - 2018-05-24
+No schema changes.
+
+## [0.0.35] - 2018-05-17
+### Added
+- Add a required `name` property to the browser schema. ([#2025])
+
+## [0.0.34] - 2018-05-03
+No schema changes.
+
+## [0.0.33] - 2018-04-26
+No schema changes.
+
+## [0.0.32] - 2018-04-19
+### Changed
+- Disallow additional properties in release_statement. ([#1790])
+- Make `prefix` and `alternative_name` mutually exclusive. ([#1836])
+
+## [0.0.31] - 2018-04-12
+### Added
+- Begin tracking MathML data in the `mathml/` directory. ([#1740])
+
+## [0.0.30] - 2018-04-05
+No schema changes.
+
+[#2511]: https://github.com/mdn/browser-compat-data/pull/2511
+[#2382]: https://github.com/mdn/browser-compat-data/pull/2382
+[#2362]: https://github.com/mdn/browser-compat-data/pull/2362
+[#2025]: https://github.com/mdn/browser-compat-data/pull/2025
+[#1836]: https://github.com/mdn/browser-compat-data/pull/1836
+[#1790]: https://github.com/mdn/browser-compat-data/pull/1790
+[#1740]: https://github.com/mdn/browser-compat-data/pull/1740
+
+[Unreleased]: https://github.com/mdn/browser-compat-data/compare/v0.0.48...HEAD
+[0.0.48]: https://github.com/mdn/browser-compat-data/compare/v0.0.47...v0.0.48
+[0.0.47]: https://github.com/mdn/browser-compat-data/compare/v0.0.46...v0.0.47
+[0.0.46]: https://github.com/mdn/browser-compat-data/compare/v0.0.45...v0.0.46
+[0.0.45]: https://github.com/mdn/browser-compat-data/compare/v0.0.44...v0.0.45
+[0.0.44]: https://github.com/mdn/browser-compat-data/compare/v0.0.43...v0.0.44
+[0.0.43]: https://github.com/mdn/browser-compat-data/compare/v0.0.42...v0.0.43
+[0.0.42]: https://github.com/mdn/browser-compat-data/compare/v0.0.41...v0.0.42
+[0.0.41]: https://github.com/mdn/browser-compat-data/compare/v0.0.40...v0.0.41
+[0.0.40]: https://github.com/mdn/browser-compat-data/compare/v0.0.39...v0.0.40
+[0.0.39]: https://github.com/mdn/browser-compat-data/compare/v0.0.38...v0.0.39
+[0.0.38]: https://github.com/mdn/browser-compat-data/compare/v0.0.37...v0.0.38
+[0.0.37]: https://github.com/mdn/browser-compat-data/compare/v0.0.36...v0.0.37
+[0.0.36]: https://github.com/mdn/browser-compat-data/compare/v0.0.35...v0.0.36
+[0.0.35]: https://github.com/mdn/browser-compat-data/compare/v0.0.34...v0.0.35
+[0.0.34]: https://github.com/mdn/browser-compat-data/compare/v0.0.33...v0.0.34
+[0.0.33]: https://github.com/mdn/browser-compat-data/compare/v0.0.32...v0.0.33
+[0.0.32]: https://github.com/mdn/browser-compat-data/compare/v0.0.31...v0.0.32
+[0.0.31]: https://github.com/mdn/browser-compat-data/compare/v0.0.30...v0.0.31
+[0.0.30]: https://github.com/mdn/browser-compat-data/compare/v0.0.29...v0.0.30