fix license typo

Author: maxmindlin

Cargo.toml

@@ -3,7 +3,7 @@ name = "openfga-dsl-parser"
 authors = ["Max Mindlin <maxmindlin@gmail.com>"]
 version = "1.0.0"
 edition = "2021"
-license = "Apache-2.0 license"
+license = "Apache-2.0"
 description = "Parsing and JSON transformer for the OpenFGA authorization DSL"
 readme = "README.md"
 repository = "https://github.com/maxmindlin/openfga-dsl-parser"