Merge pull request rp-rs#717 from jannic/release-0.9.1

Prepare release 0.9.1, update changelog

Merge pull request rp-rs#663 from jannic/update-changelog

Prepare release 0.9.0

Prepare release 0.8.2 with backport of rp-rs#612

Merge pull request rp-rs#596 from jannic/prepare-release-0.8.1

Prepare release of version 0.8.1

Merge pull request rp-rs#551 from rp-rs/prepare-release-0.8.0

Prepare release of version 0.8.0

Merge pull request rp-rs#518 from jannic/prepare-release-0.7.0

Prepare for HAL 0.7.0 release

Merge pull request rp-rs#508 from jannic/fix-changelog

Fix changelog for v0.6.1

Prepare for HAL 0.6.0 release (rp-rs#430)

* Prep for HAL 0.6.0 release

* Update changelog, readme and version number for HAL 0.5.0 release
* Bump HAL version in BSP deps
* Add the missing boards to the main README.md

Prep for HAL 0.5.0 release (rp-rs#351)

* Update changelog, readme and version number for HAL 0.5.0 release

* Bump HAL version in BSP deps

* Point ws2812-pio and i2c-pio-rs at hal_0.5.0 branches

* Update changelog with latest commits and release date

Update BSPs prior to release (rp-rs#313)

* Update BSP authors to include 'rp-rs developers'

* Update BSP readme's to reflect current release version

* Update BSP changelogs

* Fix version number in HAL README