Used openAPI 3.0.3 instead of 3.1.0 as it seems some swagger editors have problems with 3.1.0

Author: jcpitre

models/openapi/v3.0/openapi.yaml

@@ -1,5 +1,5 @@
 ---
-openapi: 3.1.0
+openapi: 3.0.3
 info:
     title: 'GBFS'
     version: '3.0'