Use proper SPDX to specify the license

A documentation excerpt being cited on GitHub ranked higher in my
search than the documentation itself. The quote was an outdated version,
temporarily preventing me from learning that the `/` license separator
is deprecated.

Author: meithecatte

enumflags/Cargo.toml

@@ -3,7 +3,7 @@ name = "enumflags2"
 version = "0.6.1"
 authors = ["maik klein <[email protected]>", "Jakub \"NieDżejkob\" Kądziołka <[email protected]>"]
 description = "Enum-based bit flags"
-license = "MIT/Apache-2.0"
+license = "MIT or Apache-2.0"
 repository = "https://github.com/NieDzejkob/enumflags2"
 readme = "../README.md"
 keywords = ["enum", "bitflag", "flag", "bitflags"]

enumflags_derive/Cargo.toml

@@ -3,7 +3,7 @@ name = "enumflags2_derive"
 version = "0.6.1"
 authors = ["maik klein <[email protected]>", "Jakub \"NieDżejkob\" Kądziołka <[email protected]>"]
 description = "Do not use directly, use the reexport in the `enumflags2` crate. This allows for better compatibility across versions."
-license = "MIT/Apache-2.0"
+license = "MIT or Apache-2.0"
 repository = "https://github.com/NieDzejkob/enumflags2"
 keywords = ["enum", "bitflag", "flag", "bitflags"]