add missing migration and check for them via Travis in the future

.travis.yml

@@ -18,6 +18,7 @@ script:
   - timeout $GREP_TIMEOUT grep -m 1 'Running migrations' <(docker-compose logs --follow app 2>&1)
   - timeout $GREP_TIMEOUT grep -m 1 'spawned uWSGI http 1' <(docker-compose logs --follow app 2>&1)
   - docker-compose run app /venv/bin/python /code/manage.py check
+  - docker-compose run app /venv/bin/python /code/manage.py makemigrations --check
 
 after_script:
   - docker-compose logs

bakerydemo/locations/migrations/0004_auto_20190912_1149.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.5 on 2019-09-12 11:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('locations', '0003_auto_20170329_0055'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='locationoperatinghours',
+            name='closed',
+            field=models.BooleanField(blank=True, help_text='Tick if location is closed on this day', verbose_name='Closed?'),
+        ),
+    ]