This gets rid of a file encoding bug that occurs on Windows boxes where
the default implied encoding is cp1252, but the files themselves aren't.

The actual patch that seems to fix this is
https://github.com/timothycrosley/isort/commit/1057d5e12edbb3030045b7a7a8c82f0848635fef
but it seems like a good idea to upgrade to the latest and greatest.