Gets config from dynaconf variables
        if variables does not exists in dynaconf try getting from
        `app.config` to support runtime settings.

def get(self, key, default=None):
        """Gets config from dynaconf variables
        if variables does not exists in dynaconf try getting from
        `app.config` to support runtime settings."""
        return self._settings.get(key, Config.get(self, key, default))