importer(CSV): support UTF-8-BOM format

[wenchy]

• close importer(CSV): support UTF-8-BOM format #317

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.15%. Comparing base (e06040e) to head (cbd7214).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #318      +/-   ##
==========================================
+ Coverage   74.13%   74.15%   +0.02%     
==========================================
  Files          82       82              
  Lines        8362     8361       -1     
==========================================
+ Hits         6199     6200       +1     
+ Misses       1586     1585       -1     
+ Partials      577      576       -1     

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