Update release notes

Author: fredericDelaporte

releasenotes.txt

@@ -3,7 +3,7 @@ Build 5.2.0
 
 Release notes - NHibernate - Version 5.2.0
 
-119 issues were resolved in this release.
+120 issues were resolved in this release.
 
     ##### Possible Breaking Changes #####
         * With PostgreSQL, an HQL query using the bitwise xor operator "^" or "bxor"
@@ -60,6 +60,7 @@ Not yet merged and not counted: #1859, #1855, #1836, #1831, #1793, #1812, #1808,
 
 ** Bug
 
+   * #1867 Fix registration of current_date for some dialects
    * #1849 Loquatious QueryCache constraint should be an IQueryCacheFactory constraint
    * #1818 Handle DbDataReaders that do not support GetSchemaTable
    * #1809 Update the mapping documentation