Update index.md (#4033)

Author: puppe1990

collections/made-in-brazil/index.md

@@ -26,6 +26,7 @@ items:
   - raphamorim/rio
   - avelino/awesome-go
   - okfn-brasil/querido-diario
+  - Purple-Stock/open-erp
 
 display_name: Made in Brazil
 created_by: caarlos0