Update to cap-std 3.0.0. (#42) #295

Job	Run time
Check Cross-Compilation (stable)	1m 53s
Check Cross-Compilation (beta)	2m 17s
Rustfmt	5s
Test on Musl (ubuntu)	21s
Test (stable)	11s
Check Cross-Compilation on Rust nightly (nightly)	1m 46s
Test (windows)	1m 19s
Test with Rust nightly (ubuntu)	23s
Test (macos)	36s
Test with Rust nightly (windows)	1m 9s
Test (macos-11.0)	37s
Test (beta)	15s
Test (ubuntu-20.04)	12s
Test (windows-2019)	1m 26s
Test (aarch64-ubuntu)	1m 50s
	14m 20s

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