Broken CI for python 3.x

[miceno]

I am getting errors on the validation of PR since there is something bad on release.py:

________________________________ pyflakes-check ________________________________
/home/travis/build/mattupstate/flask-security/scripts/release.py:114: InvalidPrintSyntax
use of >> is invalid with print function
/home/travis/build/mattupstate/flask-security/scripts/release.py:119: InvalidPrintSyntax
use of >> is invalid with print function

[TillerBurr]

This can be fixed by changing the offending lines in release.py to sys.stderr.write(message % args)