Addition to design tools: Overflow

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Hi Michel!

Loving the platform! Requesting the addition of Overflow to the design tools list. Sending over a PR in a sec. Attached our PNG logo below, let me know if you need anything else.

Cheers

[michelvanheest]

Gonna add Overflow today! Thanks for all the help! See Hi to the Proto.io team as well from me ;)

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Thanks Michel, will do!