change master to main in datapipes readme

[Mddct]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit d340632 with merge base aaae2d8 ():

UNSTABLE - The following job failed but was likely due to flakiness present on trunk and has been marked as unstable:

• pull / linux-focal-py3_8-clang9-xla / test (xla, 1, 1, linux.12xlarge, unstable) (gh)
  Process completed with exit code 128.

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[linux-foundation-easycla]

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• ✅ login: Mddct / name: Dinahao Zhou (d340632)

[albanD]

The master branch redirects to main so this doesn't change much but sounds good.

[albanD]

@pytorchbot merge

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