email is not case sensitive

KawowyDzienniczek/App/user/serializers.py

@@ -18,8 +18,7 @@ class AuthTokenSerializerByEmail(serializers.Serializer):
         email = attrs.get('email')
         password = attrs.get('password')
         queryset = User.objects.all()
-        user_by_email = get_object_or_404(queryset, email=email)
-
+        user_by_email = get_object_or_404(queryset, email__iexact=email)
         if user_by_email and password:
             user = authenticate(username=user_by_email.username, password=password)