[invoices] Quantities can be non-integers

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

apps/note/migrations/0005_auto_20210313_1235.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.2.19 on 2021-03-13 11:35
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('note', '0004_remove_null_tag_on_charfields'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='alias',
+            name='note',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='alias', to='note.Note'),
+        ),
+    ]