add protobuf to pip installation instruction

#12

cause were running into

2024-01-09T13:33:34.553796005Z The new behaviour of T5Tokenizer (with `self.legacy = False`) requires the protobuf library but it was not found in your environment. Checkout the instructions on the
2024-01-09T13:33:34.553803194Z installation page of its repo: https://github.com/protocolbuffers/protobuf/tree/master/python#installation and follow the ones
2024-01-09T13:33:34.553809701Z that match your environment. Please note that you may need to restart your runtime after installation.
gqd changed pull request title from Update README.md to add protobuf to pip installation instruction
Owner

Thanks!

jbochi changed pull request status to merged

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