Drop python 2.7 support

[codecov[bot]]

Codecov Report

Base: 97.11% // Head: 97.08% // Decreases project coverage by -0.03% :warning:

Coverage data is based on head (e7b37dc) compared to base (8bb6e0e). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #52 +/- ## ========================================== - Coverage 97.11% 97.08% -0.04% ========================================== Files 12 12 Lines 1075 1062 -13 Branches 216 227 +11 ========================================== - Hits 1044 1031 -13 Misses 12 12 Partials 19 19 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `97.08% <100.00%> (-0.04%)` | :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=Tammo+Ippen#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/tammoippen/plotille/pull/52?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen) | Coverage Δ | | |---|---|---| | [plotille/\_figure.py](https://codecov.io/gh/tammoippen/plotille/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen#diff-cGxvdGlsbGUvX2ZpZ3VyZS5weQ==) | `96.83% <ø> (-0.02%)` | :arrow_down: | | [plotille/\_canvas.py](https://codecov.io/gh/tammoippen/plotille/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen#diff-cGxvdGlsbGUvX2NhbnZhcy5weQ==) | `98.70% <100.00%> (-0.01%)` | :arrow_down: | | [plotille/\_colors.py](https://codecov.io/gh/tammoippen/plotille/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen#diff-cGxvdGlsbGUvX2NvbG9ycy5weQ==) | `100.00% <100.00%> (ø)` | | | [plotille/\_dots.py](https://codecov.io/gh/tammoippen/plotille/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen#diff-cGxvdGlsbGUvX2RvdHMucHk=) | `100.00% <100.00%> (ø)` | | | [plotille/\_figure\_data.py](https://codecov.io/gh/tammoippen/plotille/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen#diff-cGxvdGlsbGUvX2ZpZ3VyZV9kYXRhLnB5) | `93.80% <100.00%> (-0.11%)` | :arrow_down: | | [plotille/\_input\_formatter.py](https://codecov.io/gh/tammoippen/plotille/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen#diff-cGxvdGlsbGUvX2lucHV0X2Zvcm1hdHRlci5weQ==) | `99.19% <100.00%> (-0.02%)` | :arrow_down: | | [plotille/\_util.py](https://codecov.io/gh/tammoippen/plotille/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen#diff-cGxvdGlsbGUvX3V0aWwucHk=) | `94.82% <100.00%> (-0.26%)` | :arrow_down: | | [plotille/data.py](https://codecov.io/gh/tammoippen/plotille/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen#diff-cGxvdGlsbGUvZGF0YS5weQ==) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tammo+Ippen)

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