Delete error when having more than one note.

[m6mmi]

api/views.py have issue.

This should do the trick:

`class NoteDelete(generics.RetrieveUpdateDestroyAPIView):
serializer_class = NoteSerializer
permission_classes = [IsAuthenticated]

def get_object(self):
    user = self.request.user
    id = self.kwargs['pk']
    return Note.objects.get(author=user, id=id)`