Python 3 only, and type hints

[tony]

Type hints per typing

[codecov]

Codecov Report

Merging #271 (c2a1e12) into master (e6caccf) will decrease coverage by 0.95%.
The diff coverage is 92.15%.

@@            Coverage Diff             @@
##           master     #271      +/-   ##
==========================================
- Coverage   87.00%   86.04%   -0.96%     
==========================================
  Files          15       15              
  Lines         777      767      -10     
==========================================
- Hits          676      660      -16     
- Misses        101      107       +6     

Impacted Files	Coverage Δ
libvcs/exc.py	100.00% <ø> (ø)
tests/conftest.py	100.00% <ø> (ø)
tests/test_exc.py	100.00% <ø> (ø)
tests/test_hg.py	95.83% <ø> (-0.33%)	⬇️
tests/test_shortcuts.py	100.00% <ø> (ø)
tests/test_svn.py	95.00% <ø> (-0.46%)	⬇️
tests/test_util.py	100.00% <ø> (ø)
libvcs/util.py	82.85% <55.55%> (-4.65%)	⬇️
libvcs/svn.py	64.51% <63.63%> (-3.91%)	⬇️
libvcs/base.py	100.00% <100.00%> (ø)
... and 5 more

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