clock: update test suite to match canonical data
clock: update test suite to match canonical data

Closes #642.

I performed a manual comparison of the [test suite][1] and the [canonical data][2],
and determined that the set of tests is identical in each. This PR is therefore
limited to updating the version string to match that of the canonical data.

[1]: https://github.com/exercism/rust/blob/master/exercises/clock/tests/clock.rs
[2]: https://github.com/exercism/problem-specifications/blob/master/exercises/clock/canonical-data.json

petertseng/exercism-rust,exercism/xrust,petertseng/exercism-rust,petertseng/exercism-rust,exercism/xrust