mypy annotations (basic) + libvcs update

[tony]

Requires vcs-python/libvcs#420

Counterpart to vcs-python/libvcs#362

See also: http://mypy-lang.org/

[codecov]

Codecov Report

Merging #373 (6dc6ad3) into master (728c432) will increase coverage by 0.80%.
The diff coverage is 78.47%.

❗ Current head 6dc6ad3 differs from pull request most recent head 4d0e874. Consider uploading reports for the commit 4d0e874 to get more accurate results

@@            Coverage Diff             @@
##           master     #373      +/-   ##
==========================================
+ Coverage   79.37%   80.17%   +0.80%     
==========================================
  Files          14       15       +1     
  Lines         732      787      +55     
  Branches      107      113       +6     
==========================================
+ Hits          581      631      +50     
- Misses        125      130       +5     
  Partials       26       26              

Impacted Files	Coverage Δ
src/vcspull/cli/sync.py	46.37% <53.33%> (+1.54%)	⬆️
tests/test_repo.py	55.73% <60.86%> (-0.72%)	⬇️
src/vcspull/config.py	84.78% <75.60%> (+0.93%)	⬆️
tests/conftest.py	93.67% <81.81%> (-1.00%)	⬇️
tests/test_sync.py	91.54% <88.88%> (+3.41%)	⬆️
src/vcspull/types.py	100.00% <100.00%> (ø)
tests/fixtures/example.py	100.00% <100.00%> (ø)
tests/test_config.py	100.00% <100.00%> (ø)
tests/test_config_file.py	95.42% <100.00%> (ø)

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