chore: Add forgotten equal in README (#125)

Author: jylenhof

README.md

@@ -72,7 +72,7 @@ module "gce-lb-http" {
         },
       ]
 
-      iap_config {
+      iap_config = {
         enable               = false
         oauth2_client_id     = null
         oauth2_client_secret = null