Added the tensorflow-datasets and tdfs-nightly versions

[psmukherjee009]

tensorflow-datasets==3.0.0
tfds-nightly==3.1.0.dev202006230105
Needs to be also there

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[psmukherjee009]

@googlebot I signed it!

[psmukherjee009]

Can't merge as "Only those with write access to this repository can merge pull requests." so please merge the change if you have write access

[JingqingZ]

Duplicated, please remove