Add last_used and currently_active to Sports model, Views, and Tests

unisportomat/quiz/migrations/0007_auto_20210626_1130.py

unisportomat/quiz/migrations/0008_alter_sport_last_used.py

unisportomat/quiz/migrations/0009_alter_sport_last_used.py

unisportomat/quiz/migrations/0010_alter_sport_last_used.py

unisportomat/quiz/migrations/0011_alter_sport_last_used.py

unisportomat/quiz/models.py

unisportomat/quiz/serializers.py

unisportomat/quiz/tests.py

unisportomat/quiz/views.py