Update README.md

Describe ignored_unknown_status in Readme

Author: ahx

README.md

@@ -203,12 +203,11 @@ Here is how to set it up:
 
 ### Configure test coverage
 
-OpenapiFirst::Test raises an error when a request is not defined. You can deactivate this with:
+OpenapiFirst::Test raises an error when a response status is not defined. You can deactivate this with:
 
 ```ruby
 OpenapiFirst::Test.setup do |test|
-  # …
-  test.ignore_unknown_requests = true
+  [403, 401].each { test.ignored_unknown_status << it }
 end
 ```
 
@@ -234,6 +233,15 @@ OpenapiFirst::Test.setup do |test|
 end
 ```
 
+OpenapiFirst::Test raises an error when a request is not defined. You can deactivate this with:
+
+```ruby
+OpenapiFirst::Test.setup do |test|
+  # …
+  test.ignore_unknown_requests = true
+end
+```
+
 ### Test assertions
 
 openapi_first ships with a simple but powerful Test method to run request and response validation in your tests without using the middlewares. This is designed to be used with rack-test or Ruby on Rails integration tests or request specs.