Update link to is-ci’s environment variables (#1201)
Update link to is-ci’s environment variables (#1201)

is-ci moved the logic for detecting the CI server to the ci-info module, see https://github.com/watson/is-ci/commit/b78b21179f39c716e1702927ca25bc759fb61b1f.
Collinslenjo/ava,avajs/ava,andywer/ava-ts,andywer/ava-ts,BarryThePenguin/ava,avajs/ava,sindresorhus/ava,Collinslenjo/ava