message: license: use more correct license specification
  Historically, the `/` was used throughout the ecosystem, but
  the actual SPDX standard requires this to be an OR. The said
  standard also has AND, and for this reason `/` is ambiguous.
  contains some more details
  about this.
  PR
diff: name = "regex"
  version = "1.3.1" #:version
  authors = ["The Rust Project Developers"]
  -license = "MIT/Apache-2.0"
  +license = "MIT OR Apache-2.0"
  readme = "README.md"
  repository = "https://github.com/rust-lang/regex"
  documentation = "https://docs.rs/regex"
  