Optimized short range check on 4 and 5 bits (#21) #158

Job	Run time
Bitrot check	3m 1s
Intra-doc links	4m 28s
Book tests	5m 48s
Build target wasm32-unknown-unknown	5m 9s
Rustfmt	20s
Build target wasm32-wasi	4m 46s
Test on ubuntu-latest	12m 19s
Test on windows-latest	13m 36s
Test on macOS-latest	14m 42s
Test on ubuntu-latest with beta features	11m 55s
Test on windows-latest with beta features	16m 48s
Test on macOS-latest with beta features	15m 1s
Test on ubuntu-latest with nightly features	13m 24s
Test on windows-latest with nightly features	12m 31s
Test on macOS-latest with nightly features	9m 46s
	2h 23m 34s

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