Darin Morrison 986c68d82a ci: run clippy-check action on CI (#491)
This is a follow up PR for #477 that runs clippy on CI.

* Switch from hecrj/setup-rust-action to actions-rs/toolchain

* Fix remaining clippy lints

* Switch to minimal rustup profile

* Replace warning step with clippy

* Remove #![feature(async_await)]
2020-01-06 10:05:25 -08:00
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