samd21_mini 0.10.0

Board Support crate for the Sparkfun SAMD21 Mini Breakout
Documentation
# Unreleased

# v0.10.0

- update to `atsamd-hal-0.14` and other latest dependencies (#564)
- Updated to 2021 edition, updated dependencies, removed unused dependencies (#562)
- remove extraneous `embedded-hal` dependencies from BSPs
- cleanup `cortex_m` dependency
- removed unnecessary dependency on `nb` (#510)

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Changelog tracking started at v0.9.0