cargo: use SPDX license format

We were previously using '/' to indicate the dual licensing
scheme, but I guess we're now supposed to use 'OR'.

PR #843

Author: atouchet

bench/Cargo.toml

@@ -3,7 +3,7 @@ publish = false
 name = "regex-benchmark"
 version = "0.1.0"
 authors = ["The Rust Project Developers"]
-license = "MIT/Apache-2.0"
+license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/regex"
 documentation = "https://docs.rs/regex"
 homepage = "https://github.com/rust-lang/regex"

regex-capi/Cargo.toml

@@ -2,7 +2,7 @@
 name = "rure"
 version = "0.2.1"  #: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://github.com/rust-lang/regex/tree/master/regex-capi"

regex-debug/Cargo.toml

@@ -3,7 +3,7 @@ publish = false
 name = "regex-debug"
 version = "0.1.0"
 authors = ["The Rust Project Developers"]
-license = "MIT/Apache-2.0"
+license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/regex"
 documentation = "https://docs.rs/regex"
 homepage = "https://github.com/rust-lang/regex"

regex-syntax/Cargo.toml

@@ -2,7 +2,7 @@
 name = "regex-syntax"
 version = "0.6.25"  #:version
 authors = ["The Rust Project Developers"]
-license = "MIT/Apache-2.0"
+license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/regex"
 documentation = "https://docs.rs/regex-syntax"
 homepage = "https://github.com/rust-lang/regex"