Ch12 - Update expected http endpoint data (#241)

Author: milesfrain

exercises/chapter12/test/data/user.txt

@@ -1 +1 @@
-{"data":{"id":1,"email":"george.bluth@reqres.in","first_name":"George","last_name":"Bluth","avatar":"https://s3.amazonaws.com/uifaces/faces/twitter/calebogden/128.jpg"},"ad":{"company":"StatusCode Weekly","url":"http://statuscode.org/","text":"A weekly newsletter focusing on software development, infrastructure, the server, performance, and the stack end of things."}}
+{"data":{"id":1,"email":"george.bluth@reqres.in","first_name":"George","last_name":"Bluth","avatar":"https://s3.amazonaws.com/uifaces/faces/twitter/calebogden/128.jpg"},"support":{"url":"https://reqres.in/#support-heading","text":"To keep ReqRes free, contributions towards server costs are appreciated!"}}