Auto merge of #6506 - DamianX:ContributingTestLink, r=dwijnand
Auto merge of #6506 - DamianX:ContributingTestLink, r=dwijnand

Fixed link to testsuite in CONTRIBUTING.md

vojtechkral/cargo,tsurai/cargo,tshepang/cargo,rustyhorde/cargo,tshepang/cargo,tsurai/cargo,rustyhorde/cargo,rust-lang/cargo,vojtechkral/cargo,tsurai/cargo,eminence/cargo,tsurai/cargo,nipunn1313/cargo,tshepang/cargo,tshepang/cargo,rust-lang/cargo,vojtechkral/cargo,rustyhorde/cargo,nipunn1313/cargo,eminence/cargo,eminence/cargo,nipunn1313/cargo,rustyhorde/cargo,tsurai/cargo,eminence/cargo,nipunn1313/cargo,vojtechkral/cargo,rust-lang/cargo,rust-lang/cargo