Return `node`s representation as dict comprehension.

def visit_DictComp(self, node: AST, dfltChaining: bool = True) -> str:
        """Return `node`s representation as dict comprehension."""
        return f"{{{self.visit(node.key)}: {self.visit(node.value)} " \
               f"{' '.join(self.visit(gen) for gen in node.generators)}}}"