refactor(connection): Remove an unneeded borrow
refactor(connection): Remove an unneeded borrow

From clippy:

    warning: this expression borrows a reference that is immediately dereferenced by the compiler
    --> src/connection.rs:158:9
        |
    158 |         &self.socket.evented()
        |         ^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: #[warn(needless_borrow)] on by default
        = help: for further information visit https://github.com/Manishearth/rust-clippy/wiki#needless_borrow

housleyjk/ws-rs