Use proper SPDX license expression in 'Cargo.toml'.

Author: SergioBenitez

contrib/codegen/Cargo.toml

@@ -8,7 +8,7 @@ homepage = "https://rocket.rs"
 repository = "https://github.com/SergioBenitez/Rocket"
 readme = "../../README.md"
 keywords = ["rocket", "contrib", "code", "generation", "proc-macro"]
-license = "MIT/Apache-2.0"
+license = "MIT OR Apache-2.0"
 build = "build.rs"
 edition = "2018"
 

contrib/lib/Cargo.toml

@@ -8,7 +8,7 @@ homepage = "https://rocket.rs"
 repository = "https://github.com/SergioBenitez/Rocket"
 readme = "../../README.md"
 keywords = ["rocket", "web", "framework", "contrib", "contributed"]
-license = "MIT/Apache-2.0"
+license = "MIT OR Apache-2.0"
 edition = "2018"
 
 [features]

core/codegen/Cargo.toml

@@ -8,7 +8,7 @@ homepage = "https://rocket.rs"
 repository = "https://github.com/SergioBenitez/Rocket"
 readme = "../../README.md"
 keywords = ["rocket", "web", "framework", "code", "generation"]
-license = "MIT/Apache-2.0"
+license = "MIT OR Apache-2.0"
 build = "build.rs"
 edition = "2018"
 

core/http/Cargo.toml

@@ -10,7 +10,7 @@ homepage = "https://rocket.rs"
 repository = "https://github.com/SergioBenitez/Rocket"
 readme = "../../README.md"
 keywords = ["rocket", "web", "framework", "http"]
-license = "MIT/Apache-2.0"
+license = "MIT OR Apache-2.0"
 categories = ["web-programming"]
 edition = "2018"
 

core/lib/Cargo.toml

@@ -10,7 +10,7 @@ homepage = "https://rocket.rs"
 repository = "https://github.com/SergioBenitez/Rocket"
 readme = "../../README.md"
 keywords = ["rocket", "web", "framework", "server"]
-license = "MIT/Apache-2.0"
+license = "MIT OR Apache-2.0"
 build = "build.rs"
 categories = ["web-programming::http-server"]
 edition = "2018"