Editorial: Add note about superseding 2.0

Author: inexorabletash

index.bs

@@ -105,11 +105,15 @@ table.props td, table.props th {
 </style>
 
 This is the Third Edition of Indexed Database API.
-The [First Edition](https://www.w3.org/TR/2015/REC-IndexedDB-20150108/)
+The [First Edition](https://www.w3.org/TR/2015/REC-IndexedDB-20150108/),
+simply titled "Indexed Database API",
 became a W3C Recommendation on 8 January 2015.
-The [Second Edition](https://www.w3.org/TR/2018/REC-IndexedDB-2-20180130/)
+The [Second Edition](https://www.w3.org/TR/2018/REC-IndexedDB-2-20180130/),
+titled "Indexed Database API 2.0",
 became a W3C Recommendation on 30 January 2018.
 
+Indexed Database API 3.0 is intended to supersede Indexed Database API 2.0.
+
 
 <!-- ============================================================ -->
 # Introduction # {#introduction}