Allow dependent questions to depend on multiple values (#1336)

src/pretix/base/migrations/0127_auto_20190711_0705.py

@@ -0,0 +1,25 @@
+# Generated by Django 2.2.1 on 2019-07-11 07:05
+
+from django.db import migrations
+
+import pretix.base.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0126_item_show_quota_left'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='question',
+            old_name='dependency_value',
+            new_name='dependency_values',
+        ),
+        migrations.AlterField(
+            model_name='question',
+            name='dependency_values',
+            field=pretix.base.models.fields.MultiStringField(default=['']),
+        ),
+    ]