[docs] [issue15432] gzip.py: mtime argument only since python 2.7

[Roundup Robot]

Roundup Robot added the comment:

New changeset ad19a9982b03 by Georg Brandl in branch '3.3':
Closes #15432: GzipFile mtime argument is new in 3.1.
http://hg.python.org/cpython/rev/ad19a9982b03

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