fix missing flake8

Author: tomkralidis

pygeoapi/provider/xarray_.py

@@ -117,7 +117,7 @@ def get_fields(self):
         if not self._fields:
             for key, value in self._data.variables.items():
                 if key not in self._data.coords:
-                    if not {self.time_field, self.x_field, self.y_field}.issubset(value.dims):
+                    if not {self.time_field, self.x_field, self.y_field}.issubset(value.dims):  # noqa
                         continue
                     LOGGER.debug('Adding variable')
                     dtype = value.dtype