Impl, test taxon label option for triplet distance

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (21d0e97) 97.71% compared to head (f38b916) 92.90%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #134 +/- ## ========================================== - Coverage 97.71% 92.90% -4.81% ========================================== Files 619 619 Lines 8489 8502 +13 ========================================== - Hits 8295 7899 -396 - Misses 194 603 +409 ``` | [Flag](https://app.codecov.io/gh/mmore500/hstrat/pull/134/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Andres+Moreno) | Coverage Δ | | |---|---|---| | [tests](https://app.codecov.io/gh/mmore500/hstrat/pull/134/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Andres+Moreno) | `92.90% <100.00%> (-4.81%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Andres+Moreno#carryforward-flags-in-the-pull-request-comment) to find out more.

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