Update README.md

Author: swhitty

README.md

@@ -53,6 +53,9 @@ let meals = try KeyValuDecoder().decode([String].self, from: ["fish", 1])
 
 // throws DecodingError.valueNotFound 'Expected String at SELF[1].name, found nil'
 let user = try KeyValuDecoder().decode(User.self, from: [["id": 1, "name": "Herbert"], ["id:" 2])
+
+// throws DecodingError.typeMismatch 'Int at SELF[2], cannot be exactly represented by UInt8'
+let ascii = try KeyValueDecoder().decode([UInt8].self, from: [10, 100, 1000])
 ```
 
 ## Nil Encoding/Decoding Strategy