Reactivate i686 CI test #187

Job	Run time
Intra-doc links	4m 7s
Bitrot check	1m 36s
Book tests	4m 9s
Build target wasm32-unknown-unknown	4m 28s
Rustfmt	16s
Build target wasm32-wasi	4m 17s
Test on ubuntu-latest	9m 38s
Test on i686-unknown-linux-gnu	15m 31s
Test on windows-latest	11m 29s
Test on i686-unknown-linux-gnu with beta features	15m 42s
Test on macOS-latest	11m 13s
Test on i686-unknown-linux-gnu with nightly features	17m 10s
Test on ubuntu-latest with beta features	9m 33s
Test on windows-latest with beta features	11m 24s
Test on macOS-latest with beta features	10m 43s
Test on ubuntu-latest with nightly features	10m 33s
Test on windows-latest with nightly features	12m 36s
Test on macOS-latest with nightly features	11m 31s
	2h 45m 56s

Provide feedback