[issue23067] Export readline forced_update_display

[Martin Panter]

Martin Panter added the comment:

There are actually a few other patches open adding wrappers for rl_forced_update_display():

* Issue 1175004: From 2005, other APIs as well
* Issue 24727: Includes documentation

As well as the documentation, I think it would be good to add a test case for new functionality if possible.

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nosy: +vadmium
stage:  -> needs patch
versions: +Python 3.6 -Python 3.4

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