Fixed library installation command

[dproske]

trafficstars

Added "evaluate"

What does this PR do?

Updates the command at the top of the notebook so that it matches the command recommended later in the notebook: pip install transformers datasets evaluate

Without "evaluate", users can get an error when trying to import the evaluate library.

ModuleNotFoundError                       Traceback (most recent call last)
[<ipython-input-9-945d22c344e6>](https://localhost:8080/#) in <cell line: 1>()
----> 1 import evaluate
      2 
      3 accuracy = evaluate.load("accuracy")

ModuleNotFoundError: No module named 'evaluate'

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