Bump criterion to 0.3

[eclipseo]

No description provided.

[marshallpierce]

Thanks for the contribution. Looks like perhaps the criterion API has changed slightly?

[eclipseo]

https://github.com/bheisler/criterion.rs/blob/master/CHANGELOG.md

Throughput has been expanded from u32 to u64 to accommodate very large input sizes.

[codecov-io]

Codecov Report

Merging #117 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #117   +/-   ##
=======================================
  Coverage   95.89%   95.89%           
=======================================
  Files          12       12           
  Lines        1461     1461           
=======================================
  Hits         1401     1401           
  Misses         60       60

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