updated travis target to latest python, ensuring latest mock patches are usable. before, travis randomly resolved "3.4" into 3.4.2 or 3.4.4.
updated travis target to latest python, ensuring latest mock patches are usable.
before, travis randomly resolved "3.4" into 3.4.2 or 3.4.4.

gwasser/django-helpdesk,gwasser/django-helpdesk,rossp/django-helpdesk,django-helpdesk/django-helpdesk,mrkiwi-nz/django-helpdesk,gwasser/django-helpdesk,rossp/django-helpdesk,rossp/django-helpdesk,gwasser/django-helpdesk,django-helpdesk/django-helpdesk,rossp/django-helpdesk,django-helpdesk/django-helpdesk,mrkiwi-nz/django-helpdesk,mrkiwi-nz/django-helpdesk,django-helpdesk/django-helpdesk,mrkiwi-nz/django-helpdesk