fix error in gitignore

apps/invoicing/serializers.py

@@ -0,0 +1,13 @@
+from rest_framework import serializers
+
+from apps.invoicing.models import Invoice
+
+
+class InvoiceSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Invoice
+        fields = "__all__"
+        read_only_fields = [
+            "id", "number", "amount", "currency", "sync_state",
+            "odoo_invoice_id", "last_error", "synced_at",
+        ]