fix(config): change read mode from r to rb

[loonghao]

This MR is fix #349

[codecov]

Codecov Report

Merging #353 (4671258) into master (1605d69) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #353   +/-   ##
=======================================
  Coverage   97.29%   97.29%           
=======================================
  Files          35       35           
  Lines         999      999           
=======================================
  Hits          972      972           
  Misses         27       27           

Flag	Coverage Δ
unittests	97.29% <100.00%> (ø)

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Impacted Files	Coverage Δ
commitizen/config/__init__.py	100.00% <100.00%> (ø)
commitizen/config/base_config.py	100.00% <100.00%> (ø)
commitizen/config/json_config.py	100.00% <100.00%> (ø)
commitizen/config/toml_config.py	100.00% <100.00%> (ø)
commitizen/config/yaml_config.py	100.00% <100.00%> (ø)

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