add migration for previous commit

see #84 and fccfcaf

src/jane/waveforms/migrations/0003_auto_waveform_continuoustrace_unique_constraint.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.10 on 2018-08-21 13:31
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('waveforms', '0002_auto_20160706_1508'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='continuoustrace',
+            unique_together=set([('file', 'pos', 'network', 'station', 'location', 'channel', 'timerange')]),
+        ),
+    ]