fix(ext/git): Branch method not call runCmd correctly

[huhudev-git]

fix if use Branch(), it will type git command twice

• current

git git checkout sourceBranch
git git branch targetBranch

• fixed

git checkout sourceBranch
git branch targetBranch

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #213 (f54dcbc) into master (7708118) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #213   +/-   ##
=======================================
  Coverage   66.77%   66.77%           
=======================================
  Files          20       20           
  Lines        1574     1574           
=======================================
  Hits         1051     1051           
  Misses        424      424           
  Partials       99       99           

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[jannfis]

LGTM, thank you @huhudev-git !