Update headers-stage.js

Author: sydseter

cornucopia.owasp.org/script/headers-stage.js

@@ -46,10 +46,12 @@ function main() {
   ! Access-Control-Allow-Origin
   Access-Control-Allow-Origin: *
   ! Content-Type
+  Content-Type: application/json
 /api/capec/webapp/3.0
   ! Access-Control-Allow-Origin
   Access-Control-Allow-Origin: *
   ! Content-Type
+  Content-Type: application/json
 /api/cre/mobileapp/en
   ! Access-Control-Allow-Origin
   Access-Control-Allow-Origin: *