Reorganize imports of api views.py

api/views.py

@@ -1,7 +1,5 @@
-from django_filters.rest_framework import DjangoFilterBackend
-from rest_framework import viewsets, generics, filters
 from rest_framework.permissions import IsAuthenticated, IsAdminUser
-from rest_framework.response import Response
+from rest_framework import viewsets
 
 from .serializers import ContestSerializer, BandSerializer, FrequencySerializer, EntryCategorySerializer, \
     ReferenceSerializer, QSOSerializer, ShadowCallSerializer, UserSerializer