Take into account Pablo's review #523

Job	Run time
Book tests	2m 11s
Bitrot check	1m 45s
Build target wasm32-unknown-unknown	2m 41s
Code coverage	2h 20m 53s
Build target wasm32-wasi	2m 30s
Intra-doc links	2m 17s
Rustfmt	14s
Test on ubuntu-latest	9m 26s
Test on i686-unknown-linux-gnu	16m 47s
Test on windows-latest	13m 26s
Test on i686-unknown-linux-gnu with beta features	17m 23s
Test on macOS-latest	7m 31s
Test on i686-unknown-linux-gnu with nightly features	19m 56s
Test on ubuntu-latest with beta features	9m 42s
Test on windows-latest with beta features	13m 34s
Test on macOS-latest with beta features	7m 25s
Test on ubuntu-latest with nightly features	10m 8s
Test on windows-latest with nightly features	13m 46s
Test on macOS-latest with nightly features	8m 27s
	5h 0m 2s

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