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.

Author: bors

crates/cargo-test-support/Cargo.toml

@@ -2,6 +2,7 @@
 name = "cargo-test-support"
 version = "0.1.0"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
+license = "MIT OR Apache-2.0"
 edition = "2018"
 
 [lib]