Update version to 1.0.0

Signed-off-by: Valentin Samir <valentin.samir@crans.org>
Status Job ID Name Coverage
  Test
canceled #1431
check_rst

canceled #1443
coverage

canceled #1430
flake8

canceled #1435
py27-django110

canceled #1432
py27-django17

canceled #1433
py27-django18

canceled #1434
py27-django19

canceled #1439
py34-django110

canceled #1436
py34-django17

canceled #1437
py34-django18

canceled #1438
py34-django19

canceled #1442
py35-django110

canceled #1440
py35-django18

canceled #1441
py35-django19