Per GH-560, the current definition of `python_version` is not compatible
with a 2+ digit major or minor version. There were no objections to
changing the definition to more accurately reflect the semantic content
intended to be conveyed (i.e. the major and minor version).
* Change the specification example to be clearer.
Previously, we compared python_version < "2.7.10".
As python_version only keeps the major and minor number (2.7, 3.2),
it could lead to unexpected behaviour when comparing to 3-parts versions.
Changing the example might reduce the risk of making that small but
confusing mistake.
* Fix mistake in Backwards Compatibility about python_version.
In this section, it said:
"handle version comparisons with python_version "2.7.10" differently."
while is should have mentionned python_full_version, as python_version
will never have a 3-part version value.
Christopher Hunt
Paul Ganssle
Min ho Kim
Kevin
Michael Laing
Mariatta
Huang Huang
Brett Cannon
Vincent Philippon
Nick Coghlan
Marti Raudsepp
Donald Stufft