Continuous integration

Fix `README.md` formatting for languages section #13

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Run time

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Job	Run time
Run linter	20s
Test (stable)	31s
check-examples	13s
Test (beta)	38s
check docs	15s
fmt	17s
Test (nightly)	15s
Test (msrv)	31s
CI succeeded	1s
	3m 1s