[Python-Dev] 3.3 branch is now in security fix mode

[Georg Brandl]

Hi all,

since 3.3.5 and 3.4.0 practically coincided, it is a good point to end the
bugfix maintenance of the 3.3 branch.

Please only commit security-related fixes to 3.3 from now -- like for 3.2 --
and as always, please set tracker issues that relate to security fixes to
"release blocker" priority.

Georg