Change crossbeam-channel's license to MIT OR Apache-2.0.

Author: nical

crossbeam-channel/Cargo.toml

@@ -6,7 +6,7 @@ name = "crossbeam-channel"
 # - Create "crossbeam-channel-X.Y.Z" git tag
 version = "0.4.2"
 authors = ["The Crossbeam Project Developers"]
-license = "MIT/Apache-2.0 AND BSD-2-Clause"
+license = "MIT OR Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/crossbeam-rs/crossbeam"
 homepage = "https://github.com/crossbeam-rs/crossbeam/tree/master/crossbeam-channel"