Fix: Date value out of range when changing default TIME_ZONE variable to another value

[jhonvidal]

For example, when changing the value of TIME_ZONE="America/Caracas" in the configuration file (testshop/settings.py), the following error is reported when running the tests:

My solution is to increase the minimum date by 1 week and decrease the maximum date by 1 week, this way when they change the TIME_ZONE value it doesn't run a date out of range error. By applying this solution you can verify that all tests were satisfactory:

• Note: code formatted in PEP-8 style

[jhonvidal]

It looks like the Travis CI is stuck. What can be done? or how can I help with the review and merge

[jrief]

django-SHOP should be migrated towards Github actions anyway.

Travis-CI is dead.