Requested mime type is not registered: text/rtf

[krouskop]

A mapping between .rtf and application/rtf is present, but .rtf can also be associated to text/rtf (see: https://www.iana.org/assignments/media-types/text/rtf)

Can that also be added?

[lofcz]

FYI, I've implemented this in the successor library https://github.com/lofcz/MimeTypeCore, thanks for pointing this out!