Add Medallia logo to users

[yorch]

No description provided.

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[wincent]

Thanks @yorch. Will get this merged as soon as the bot comments here that the CLA has been signed.

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[yorch]

Thanks @wincent!!