Make migrations for new fields on comment

- Alter field in_agreement on comment
- Alter field in_disagreement on comment
- Alter field in_notsure on comment
- Alter field is_cor on comment

comments/migrations/0004_auto_20161213_1208.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.3 on 2016-12-13 11:08
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('comments', '0003_auto_20160404_2150'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='comment',
+            name='in_agreement',
+            field=models.ManyToManyField(blank=True, related_name='in_agreement', to='scipost.Contributor'),
+        ),
+        migrations.AlterField(
+            model_name='comment',
+            name='in_disagreement',
+            field=models.ManyToManyField(blank=True, related_name='in_disagreement', to='scipost.Contributor'),
+        ),
+        migrations.AlterField(
+            model_name='comment',
+            name='in_notsure',
+            field=models.ManyToManyField(blank=True, related_name='in_notsure', to='scipost.Contributor'),
+        ),
+        migrations.AlterField(
+            model_name='comment',
+            name='is_cor',
+            field=models.BooleanField(default=False, verbose_name='correction/erratum'),
+        ),
+    ]