docs(jsdoc): ObjectGraph is inherited class.

src/lib/adapters/object.js

@@ -3,13 +3,13 @@ import lodash from 'lodash';
 import { EventEmitter } from 'fbemitter';
 
 /**
- * Class to inherit. Class with methods for control links in graph.
+ * Inherited class. Class with methods for control links in graph.
  * Adapted for array collection.
  * 
  * @class
  * @alias ancient-graph.ObjectGraph
  */
-export class Graph extends AncientGraph {
+class ObjectGraph extends AncientGraph {
 
   /**
    * Construct new graph and checks for required adaptation methods.
@@ -321,4 +321,6 @@ export class Graph extends AncientGraph {
    * @param {Link} [newLink] - can be undefined on unlink and remove events
    * @param {Object} [context] - additional app information, such as context.userId
    */
-};
+};
+
+export { ObjectGraph as Graph };