Prepare e-h 1.0.0-alpha.9 release

[rust-highfive]

r? @therealprof

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[bors[bot]]

Merge conflict.

[bors[bot]]

Build succeeded:

• clippy
• fmt
• test (1.54.0, thumbv6m-none-eabi)
• test (1.54.0, thumbv7m-none-eabi)
• test (1.54.0, x86_64-unknown-linux-gnu)
• test (nightly, thumbv6m-none-eabi)
• test (nightly, thumbv7m-none-eabi)
• test (nightly, x86_64-unknown-linux-gnu)
• test (stable, thumbv6m-none-eabi)
• test (stable, thumbv7m-none-eabi)
• test (stable, x86_64-unknown-linux-gnu)

[Dirbaio]

@eldruin I went ahead and did the release. Hope haven't missed anything: cargo publish, created the git tag, and created the release on github with the release notes. Is that all? :D

[eldruin]

That's all, thanks!