Install mypy stubs

Author: Mauko Quiroga

setup.py

@@ -36,7 +36,9 @@
     'pytest-cov >= 2.6.1, < 3.0.0',
     'mypy >= 0.701, < 1.000',
     'openfisca-country-template >= 3.10.0, < 4.0.0',
-    'openfisca-extension-template >= 1.2.0rc0, < 2.0.0'
+    'openfisca-extension-template >= 1.2.0rc0, < 2.0.0',
+    'types-PyYAML == 5.4.10',
+    'types-setuptools == 57.0.2',
     ] + api_requirements
 
 setup(