Auto merge of #7698 - dtolnay:description, r=alexcrichton
Auto merge of #7698 - dtolnay:description, r=alexcrichton

Remove use of deprecated Error::description method

We are getting ready to deprecate std::error::Error::description: rust-lang/rust#66919. This PR replaces one place that should be using Display instead.

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