Add gotham team members to crates.io authors

Hi @secretfader. Since this crate was merged into the core gotham codebase, the gotham team cannot publish a new version to crates.io with the same name. Any chance you can add the core gotham team members as authors on Crates.io, so we can do that? Core members are @nyarly @whitfin @colinbankier. Cheers!