Update powered_by.yml
Update powered_by.yml

Summary:
Added Pics for Reddit to the list

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Explain the **motivation** for making this change. What existing problem does the pull request solve?

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For more info, see the ["Pull Requ
Closes https://github.com/facebook/fresco/pull/1690

Reviewed By: kirwan

Differential Revision: D4762042

Pulled By: oprisnik

fbshipit-source-id: 1c6d224a6c94d1c9a470b68043323f4e585d7768

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