operators.py 里的 RandomFlipOrRotation 缺失image2的变化操作

[HaitaoWuTJU]

sample['image'] = self.apply_im(sample['image'], mode_id, True)

[HaitaoWuTJU]

@add
if 'image2' in sample:
sample['image2'] = self.apply_im(sample['image2'], mode_id, True)

[geoyee]

it has been added in #93 , and it is waiting for the merger