Close #562 PR: Add note about running tests in serial.
Close #562 PR: Add note about running tests in serial.

Collinslenjo/ava,andywer/ava-ts,andywer/ava-ts,Collinslenjo/ava,avajs/ava,BarryThePenguin/ava,avajs/ava,sindresorhus/ava