Auto merge of #8386 - crlf0710:master, r=ehuss
Auto merge of #8386 - crlf0710:master, r=ehuss

Add missing license field.

Hi, i was playing with `cargo-deny`, and found that it says this crate doesn't have a license field. So i'm going ahead and add it for consistency.

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