revert template literals to concatenation

Author: Ashley Schauer

lib/deserializer-utils.js

@@ -47,7 +47,7 @@ module.exports = function (jsonapi, data, opts) {
         }
 
         return Promise
-          .all([extractAttributes(included), extractRelationships(included, `${ancestry}:${included.type}${included.id}`)])
+          .all([extractAttributes(included), extractRelationships(included, ancestry + ':' + included.type + included.id)])
           .then(function (results) {
             var attributes = results[0];
             var relationships = results[1];
@@ -146,7 +146,7 @@ module.exports = function (jsonapi, data, opts) {
 
   this.perform = function () {
     return Promise
-      .all([extractAttributes(data), extractRelationships(data, `${data.type}${data.id}`)])
+      .all([extractAttributes(data), extractRelationships(data, data.type + data.id)])
       .then(function (results) {
         var attributes = results[0];
         var relationships = results[1];