Add sources migration to add related name

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/sources/migrations/0024_auto_20191219_0252.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.26 on 2019-12-19 02:52
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sources', '0023_auto_20191213_0044'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='intervalbasemodel',
+            name='document_type',
+            field=models.ForeignKey(help_text='Assign a document type to documents uploaded from this source.', on_delete=django.db.models.deletion.CASCADE, related_name='interval_sources', to='documents.DocumentType', verbose_name='Document type'),
+        ),
+    ]