build

Fix `wasm32` + `#[no_std]` compatibility #83

Job	Run time
clippy	13s
test-doc	3m 17s
test-cross (ubuntu-latest, mips-unknown-linux-gnu, stable)	8s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	2m 41s
test-cross (ubuntu-latest, arm-unknown-linux-gnueabi, stable)	1m 26s
test (macos-latest, x86_64-apple-darwin, stable)	2m 52s
test-msrv	3m 2s
test-cross (ubuntu-latest, aarch64-unknown-linux-gnu, stable)	3m 40s
test-no-std	2m 29s
test (windows-latest, x86_64-pc-windows-gnu, stable)	4m 38s
test-cross (ubuntu-latest, arm-unknown-linux-gnueabi, nightly)	3m 44s
test (windows-latest, x86_64-pc-windows-msvc, beta)	3m 38s
test-cross (ubuntu-latest, aarch64-unknown-linux-gnu, nightly)	1m 33s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	1m 14s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	2m 46s
	37m 21s

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