Add missing dependencies and make recent version mypy happy

mypy.ini

@@ -22,4 +22,5 @@ ignore_missing_imports = True
 [mypy-pytest.*]
 ignore_missing_imports = True
 
-
+[mypy-yaml.*]
+ignore_missing_imports = True

requirements.txt

@@ -2,3 +2,6 @@
 # should match https://pypi.python.org/pypi names. For the full spec or
 # dependency lines, see https://pip.readthedocs.org/en/1.1/requirements.html
 python-keycloak >= 0.19.0
+PyYAML
+click
+types-click

swh/__init__.py

 from pkgutil import extend_path
-from typing import Iterable
+from typing import List
 
-__path__: Iterable[str] = extend_path(__path__, __name__)
+__path__: List[str] = extend_path(__path__, __name__)