Specify correct logo email in _data/users.yml

[nastevens]

Corrects the email address for sending logos for the Friends of Rust page.

@brson @steveklabnik

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nikomatsakis (or someone else) soon.

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[steveklabnik]

Thanks a ton! Got your email, as well.