feat(ISSUE-8): fixing error caused by ManyToManyField on confirmation (#9)

* feat(ISSUE-8): ISSUE-8: ManyToManyField causes error on confirmations

* feat(ISSUE-8): Update some readme and remove print statements

Co-authored-by: Thu Trang Pham <thu@joinmodernhealth.com>

tests/market/migrations/0005_shoppingmall.py

@@ -0,0 +1,21 @@
+# Generated by Django 3.1.6 on 2021-02-18 17:46
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('market', '0004_inventory_notes'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ShoppingMall',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=120)),
+                ('shops', models.ManyToManyField(to='market.Shop')),
+            ],
+        ),
+    ]