Merge pull request #305 from linebender/v0_10 #394

Job	Run time
cargo fmt	7s
cargo test msrv	4m 3s
Docs (macOS-latest)	36s
cargo test nightly (macOS-latest)	1m 9s
Docs (windows-2019)	1m 45s
cargo test nightly (windows-2019)	1m 6s
cargo clippy+test (macOS-latest)	1m 53s
Docs (ubuntu-latest)	34s
cargo test nightly (ubuntu-latest)	36s
cargo clippy+test (wasm32) (macOS-latest)	44s
cargo clippy+test (windows-2019)	2m 18s
cargo clippy+test (wasm32) (windows-2019)	2m 50s
cargo clippy+test (ubuntu-latest)	58s
cargo clippy+test (wasm32) (ubuntu-latest)	41s
	19m 20s

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