Drop python 2.7

[tony]

See also vcs-python/libvcs#271 / libvcs 0.9.0

[codecov]

Codecov Report

Merging #307 (6d0a568) into master (b73f18d) will decrease coverage by 0.41%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #307      +/-   ##
==========================================
- Coverage   82.76%   82.34%   -0.42%     
==========================================
  Files          11       11              
  Lines         673      657      -16     
==========================================
- Hits          557      541      -16     
  Misses        116      116              

Impacted Files	Coverage Δ
tests/conftest.py	82.75% <ø> (-0.58%)	⬇️
tests/helpers.py	77.27% <ø> (-1.90%)	⬇️
tests/test_cli.py	50.00% <ø> (-4.55%)	⬇️
tests/test_config.py	97.34% <ø> (-0.03%)	⬇️
tests/test_repo_object.py	77.68% <ø> (-0.37%)	⬇️
vcspull/cli.py	58.06% <ø> (-0.89%)	⬇️
vcspull/cli_defaultgroup.py	52.83% <ø> (-0.88%)	⬇️
vcspull/config.py	96.69% <ø> (-0.06%)	⬇️
vcspull/exc.py	100.00% <ø> (ø)
vcspull/util.py	92.30% <ø> (-1.03%)	⬇️

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