Bug: cargo bench fails due to missing create time

[cgmcintyr]

On master branch, commit b5b44bccfc0472e3c9003e5614a0df9339277fa8, running cargo bench results in the following error:

Compiling tiny_http v0.6.2 (/home/cgm/devel/rust/tiny-http)
error[E0463]: can't find crate for `time`
 --> benches/bench.rs:5:1
  |
5 | extern crate time;
  | ^^^^^^^^^^^^^^^^^^ can't find crate

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error: Could not compile `tiny_http`.

To learn more, run the command again with --verbose.