itertools version mismatch for crates from registry

[jongiddy]

criterion 0.6 depends on criterion-plot 0.5. The first crate depends on itertools 0.13 and the second (published) crate depends on itertools 0.10.

In master they both depend on itertools 0.13. For local development, the plot directory is defined using path so the versions are consistent. It is only when downloading from the registry that the mismatch occurs.

Should criterion-plot be released as v0.6 and criterion released to depend on criterion-plot 0.6 to avoid including two versions of itertools?

[briansmith]

See PR #875 and PR #876, which suggest the dependency could just be eliminated completely.