TensorFlow Image

Could anyone please shed some light on the below?
In the TensorFlow Deep Learning Framework docker image, I don’t see python 3.6 image.
Why Nvidia Tensorflow docker image doesn’t have Python 3.6 and only have support for python 3.5 and 2.7 ?
When the TensorFlow docker image will include Python 3.6 and 3.7?

Thanks in advance!