Fix class reference

[joar]

This stops PyCharm from complaining that my Client instance isn't of type client.py

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[tseaver]

@joar Thanks for the patch. Can you please do the CLA-signing dance?

[joar]

@tseaver I tried once and it looked successful, I'll try again.

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CLAs look good, thanks!

[joar]

Ah, I just needed to reply to trigger a re-check:

Once you've signed (or fixed any issues), please reply here (e.g. I signed it!) and we'll verify it.
#6153 (comment)

[tseaver]

@theacodes Any clue why kokoro did not run here?