csv with BOM, detected as text/plain

[hanpeic]

Hello,

I use version 1.0.4 with carriewave, the file is csv with BOM, but it detected content_type text/plain

see below screenshot, the first file is csv, it detected as text/csv
the second file is csv with BOM, it detected as text/plain

[alexanderadam]

Is this still an issue?
Because I just tried it with a BOM CSV and it seems to work (see also #134).

Otherwise feel free to provide a CSV for reproducibility which does not work.