removed unused import

main/models.py

@@ -4,7 +4,7 @@ from dateutil.relativedelta import relativedelta
 from django.conf import settings
 from django.core.paginator import Paginator
 from django.db import models
-from django.http import HttpResponseRedirect, HttpResponse, JsonResponse
+from django.http import HttpResponseRedirect, JsonResponse
 from django.shortcuts import render
 from django.utils import timezone
 from modelcluster.contrib.taggit import ClusterTaggableManager