Add a 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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Added ability to list the available fonts found by svg2pdf. Thanks to [@rgreinho](https://github.com/rgreinho).
+- Added support for filter rendering.
+- `usvg` is now reexported to prevent version mismatches.
+
+### Fixed
+- Fixed dpi ratio calculation. Thanks to [@Ultraxime](https://github.com/Ultraxime).
+
+### Changed
+- Bumped resvg to v0.37 and fontdb to 0.16.
+- (Internal) reworked the test suite.
+- (Internal) synced test suite with resvg test suite.