feat: consider multiple images

[achillesrasquinha]

This change encourages to return images wherein one wishes to return multiple images for augmentation.

Example

import deeply.img.augmenters as dia # https://github.com/achillesrasquinha/deeply
import imgaug.augmenters as iaa

image = ia.quokka()

augmenter = dia.Combination([
    iaa.Fliplr(1.0),
    iaa.Flipud(1.0)
])

images = augmenter(images = [image])
print(len(images)) # => 4

[achillesrasquinha]

Hello, any update?