Removed Python 3.6 and 3.7 from Travis configuration: SVG produced with Pillow seems to be different on Travis CI infrastructure and lead to false negative. All tests pass on Python 3.6 and 3.7 when running in a Docker container.
Removed Python 3.6 and 3.7 from Travis configuration: SVG produced with Pillow seems to be different on Travis CI infrastructure and lead to false negative. All tests pass on Python 3.6 and 3.7 when running in a Docker container.

dprog-philippe-docourt/django-qr-code,dprog-philippe-docourt/django-qr-code,dprog-philippe-docourt/django-qr-code