fix skip_not_36 condition
@@ -7,7 +7,7 @@ import pytest
from pydantic import ConfigError, ValidationError
-skip_not_36 = pytest.mark.skipif(sys.version_info > (3, 6), reason='testing == 3.6.x behaviour only')
+skip_not_36 = pytest.mark.skipif(sys.version_info >= (3, 7), reason='testing == 3.6.x behaviour only')
@skip_not_36
