Take into account Pablo's review #525

Job	Run time
Build target wasm32-unknown-unknown	2m 40s
Bitrot check	1m 38s
Book tests	2m 19s
Build target wasm32-wasi	2m 27s
Code coverage	3h 22m 4s
Intra-doc links	2m 15s
Rustfmt	18s
Test on i686-unknown-linux-gnu	23m 43s
Test on ubuntu-latest	11m 11s
Test on i686-unknown-linux-gnu with beta features	23m 34s
Test on windows-latest	15m 21s
Test on i686-unknown-linux-gnu with nightly features	24m 22s
Test on macOS-latest	9m 29s
Test on ubuntu-latest with beta features	11m 28s
Test on windows-latest with beta features	15m 14s
Test on macOS-latest with beta features	9m 25s
Test on ubuntu-latest with nightly features	11m 41s
Test on windows-latest with nightly features	15m 55s
Test on macOS-latest with nightly features	9m 9s
	6h 34m 13s

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