Update the version history

doc/version_history.rst

@@ -6,6 +6,25 @@
 Version History
 ###############
 
+v6.8.2
+------
+
+Changes:
+
+* `Remote` and `SalInfo`: improve retrieval of historical data in one special case:
+  reading an indexed SAL component using index=0 in the `Remote` (meaning "read data from all indices").
+  Formerly there would be only 1 sample of historical data: the most recent sample output with any index.
+  Now retrieve the most recent sample _for each index_, in the order received.
+
+Requirements:
+
+* ts_ddsconfig
+* ts_idl 2
+* ts_utils 1
+* ts_xml 6.2
+* IDL files for Test and Script generated by ts_sal 5
+* SALPY_Test generated by ts_sal 5 or 6
+
 v6.8.1
 ------