[issue37330] open(): remove 'U' mode, deprecated since Python 3.3

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> docutils is already fixed in the development version. I requested a release: https://sourceforge.net/p/docutils/bugs/364/

At 2019-07-22,  Günter Milde wrote: "Docutils 0.15 is released" (with the fix). The latest docutils version is 0.17.1.

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