Implement script to create customer account for customer placed order…

… before (fossasia#277)

* implement script to create customer account for customer placed order before

src/pretix/base/management/commands/create_customer_account.py

@@ -38,7 +38,7 @@ def handle(self, *args, **options):
             # Get all orders email and check if they have a customer account or not
             for order in orders:
                 if order.email:
-                    customer = Customer.objects.filter(email=order.email).first()
+                    customer = Customer.objects.filter(email__iexact=order.email).first()
                     if not customer:
                         name_parts_data = {
                             "_scheme": "full",