First draft at 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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.10.0] - 2022/07/31
+
+Version 0.10.0 brings about many new features. As with most `agb` upgrades, you will need to update your `gba.ld` and `gba_mb.ld` files which you can find in the [template repo](https://github.com/agbrs/template). We would also recommend copying the `[profile.dev]` and `[profile.release]` sections from `Cargo.toml` if you don't have these values already.
+
+### Added
+- Random number generator in agb::rng
+- Z-Ordering of sprites
+- Very basic font rendering - looking for feedback, this API is far from stable
+- Transparent sprite support with aseprite
+- 32kHz audio. Probably the best sound quality you'll get out of the hardware, but uses a lot of ROM space
+- Faster implementation of memcpy and memset thanks to the agbabi crate which provide a big performance boost for any project using agb
+- You can now write tests for projects depending on agb
+- Many functions previously undocumented are now documented
+- If you wish, you can now optionally do dynamic memory allocation to IWRAM instead of only EWRAM
+- [Hyperspace roll](https://lostimmortal.itch.io/hyperspace-roll), a new game built for the GMTK Game Jam 2022. The source code can be found in the `examples` directory.
+- You can now use 64x64px sprites
+- You can now configure the background size for tiled backgrounds
+- It is possible to create 'dynamic tiles' for backgrounds. These are tiles which are defined at runtime
+- Started using GitHub discussions as a forum
+
+### Changed
+- Background tiles are now removed from VRam during `commit()` if they are no longer used rather than immediately reducing flickering
+- Audio system optimisations - reduced CPU usage by more than 50%
+- Improved the README for both the main agb crate and the template
+- The template now builds with optimisations in debug mode and debug symbols in release mode
+- Added `#[must_use]` to many of the places it is needed
+- All subcrates get released at once, so versions are kept in lockstep
+- A few methods accepting `Num<..>` have been changed to accept `impl Into<Num<..>>` to make them easier to use
+
+### Removed
+- The ability to use timer0 and timer1 through the `timer` module. This was done in order to fully support 32kHz audio
+
+### Fixed
+- Sprite data is now correctly aligned so fast copies will always work
+- A few methods which should really be internal have had `pub` removed
+- The crate now compiles (but does not run) doctests in CI which pointed out a large number of non-compiling examples