Add migration support for field max_length changes.

Author: Shaheed Haque

django_celery_beat/migrations/0006_auto_20180210_1226.py

@@ -0,0 +1,28 @@
+# Generated by Django 2.0.1 on 2018-02-10 12:26
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('django_celery_beat', '0005_add_solarschedule_events_choices'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='crontabschedule',
+            name='day_of_month',
+            field=models.CharField(default='*', max_length=124, verbose_name='day of month'),
+        ),
+        migrations.AlterField(
+            model_name='crontabschedule',
+            name='hour',
+            field=models.CharField(default='*', max_length=96, verbose_name='hour'),
+        ),
+        migrations.AlterField(
+            model_name='crontabschedule',
+            name='minute',
+            field=models.CharField(default='*', max_length=240, verbose_name='minute'),
+        ),
+    ]