removing 1.6 and adding 1.9 to CI
removing 1.6 and adding 1.9 to CI

epantry/django-sql-explorer,epantry/django-sql-explorer,dsanders11/django-sql-explorer,enstrategic/django-sql-explorer,dsanders11/django-sql-explorer,groveco/django-sql-explorer,groveco/django-sql-explorer,dsanders11/django-sql-explorer,epantry/django-sql-explorer,grantmcconnaughey/django-sql-explorer,dsanders11/django-sql-explorer,enstrategic/django-sql-explorer,grantmcconnaughey/django-sql-explorer,enstrategic/django-sql-explorer,groveco/django-sql-explorer,enstrategic/django-sql-explorer,groveco/django-sql-explorer,grantmcconnaughey/django-sql-explorer