Merge pull request #954 from ssbarnea/fix/py.typed

Mark library as typed (PEP-561)

Author: Julian

jsonschema/py.typed

@@ -63,7 +63,7 @@ console_scripts =
     jsonschema = jsonschema.cli:main
 
 [options.package_data]
-jsonschema = schemas/*.json, schemas/*/*.json
+jsonschema = py.typed, schemas/*.json, schemas/*/*.json
 
 [flake8]
 ban-relative-imports = true