[issue19543] Add -3 warnings for codec convenience method changes

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0347f6e14ad6 by Tal Einat in branch '3.5':
Issue #19543: Implementation of isclose as per PEP 485
https://hg.python.org/cpython/rev/0347f6e14ad6

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<http://bugs.python.org/issue19543>
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