Add missing migration

journals/migrations/0048_auto_20181023_2150.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.4 on 2018-10-23 19:50
+from __future__ import unicode_literals
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('journals', '0047_auto_20181023_0829'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='publication',
+            name='doi_label',
+            field=models.CharField(db_index=True, max_length=200, unique=True, validators=[django.core.validators.RegexValidator('^(SciPostPhysProc|SciPostPhysSel|SciPostPhysLectNotes|SciPostPhysCodeb|SciPostPhysComm|SciPostPhys)(.\\w+(.[0-9]+(.[0-9]{3,})?)?)?$', 'Only valid DOI expressions are allowed: `[a-zA-Z]+(.\\w+(.[0-9]+(.[0-9]{3,})?)?)?`')]),
+        ),
+    ]