Fix syntax

Author: ecederstrand

pyproject.toml

@@ -8,7 +8,7 @@ name="tableauserverclient"
 dynamic = ["version"]
 description='A Python module for working with the Tableau Server REST API.'
 authors = [{name="Tableau", email="github@tableau.com"}]
-license="Apache-2.0",
+license = "Apache-2.0"
 license-files = ["LICENSE"]
 readme = "README.md"