Add 418 error (#2)

* Update config.json

Add 418 error

* Update CHANGELOG.md

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this package will be documented in this file.
 
 The format is based on [Keep a Changelog][keepachangelog] and this project adheres to [Semantic Versioning][semver].
 
+## Unreleased
+
+### Added
+
+- 418 status code error page
+
 ## v1.2.0
 
 ### Fixed

config.json

@@ -82,6 +82,11 @@
             "message": "Requested Range Not Satisfiable",
             "description": "The requested byte range is not available and is out of bounds"
         },
+        {
+            "code": 418,
+            "message": "I'm a teapot",
+            "description": "Attempt to brew coffee with a teapot is not supported"
+        },
         {
             "code": 429,
             "message": "Too Many Requests",