[docs] [issue15204] Deprecate the 'U' open mode

[Chris Jerdonek]

Chris Jerdonek added the comment:

Thanks, Serhiy. :)  Sure, I should be able to help with the documentation portion of this issue if the community is in agreement.  Would the deprecation need to be moved up to 3.4 though now?

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<http://bugs.python.org/issue15204>
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