Add annotations for migration to silence type error

Author: dmoisset

polls/migrations/0001_initial.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.10.1a1 on 2016-08-26 14:38
 from __future__ import unicode_literals
+from typing import Tuple, List
 
 from django.db import migrations, models
 import django.db.models.deletion
@@ -11,7 +12,7 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-    ]
+    ]  # type: List[Tuple[str, str]]
 
     operations = [
         migrations.CreateModel(