Merge branch...

Merge branch '23-typeerror-underlying-read-should-have-returned-a-bytes-like-object-not-str' into 'master'

Fixed issue of TextIO around TextIO

Closes #23 

Without understanding, where the error comes from, I provide a work-around that should work.

See merge request !23
12 jobs for 24-bug-in-roc-curves in 3 minutes and 4 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
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  Test
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