Remove import of old min_max

aleksis/apps/chronos/views.py

@@ -18,7 +18,6 @@ from .forms import LessonSubstitutionForm
 from .models import LessonPeriod, LessonSubstitution, TimePeriod, Room
 from .tables import LessonsTable
 from .util.js import date_unix
-from .util.min_max import period_min, period_max, weekday_min_, weekday_max
 from .util.prev_next import get_next_relevant_day, get_prev_next_by_day
 from .util.weeks import CalendarWeek, get_weeks_for_year
 from aleksis.core.util.core_helpers import has_person