Add NOT_ACCEPTABLE to the README in error codes section

jerelmiller · jerelmiller · commit be9adbbc4cf7 · 2016-05-06T11:53:29.000-06:00
diff --git a/README.md b/README.md
@@ -1355,6 +1355,7 @@ module JSONAPI
   SAVE_FAILED = '121'
   FORBIDDEN = '403'
   RECORD_NOT_FOUND = '404'
+  NOT_ACCEPTABLE = '406'
   UNSUPPORTED_MEDIA_TYPE = '415'
   LOCKED = '423'
 end
