Add supsuper to CONTRIBUTORS
Add supsuper to CONTRIBUTORS

jgallagher/rusqlite,xinghun92/rusqlite,jgallagher/rusqlite,mikelodder7/rusqlcipher,mikelodder7/rusqlcipher,mikelodder7/rusqlcipher,gwenn/rusqlite,xinghun92/rusqlite,gwenn/rusqlite,jgallagher/rusqlite,xinghun92/rusqlite,gwenn/rusqlite