Update release notes

Author: fredericDelaporte

releasenotes.txt

@@ -3,7 +3,7 @@ Build 5.2.0
 
 Release notes - NHibernate - Version 5.2.0
 
-117 issues were resolved in this release.
+119 issues were resolved in this release.
 
     ##### Possible Breaking Changes #####
         * With PostgreSQL, an HQL query using the bitwise xor operator "^" or "bxor"
@@ -110,12 +110,14 @@ Not yet merged and not counted: #1859, #1855, #1836, #1831, #1793, #1812, #1808,
    * #1796 Support CacheMode in QueryBatch
    * #1786 Document future results
    * #1772 Support futures with stateless session
+   * #1752 Async ISynchronization
    * #1742 Add new DB2CoreDriver to use with IBM.Data.DB2.Core provider
    * #1693 Implement SurrogateSelector
    * #1690 Bitwise xor not supported by SQLite
    * #1682 Add support for System.MathF methods
    * #1662 Add support for SAP HANA
    * #1633 Added support for batching 2nd level cache operations when loading entities and collections
+   * #1631 Create UtcTicks and UtcDbTimestamp types
    * #1599 Full control of entities fetching in Criteria
    * #1381 NHibernate's IQuery is missing AddSynchronizedQuerySpace
    * #897 NH-2187 - ElementAt LINQ extension method is not supported.