CHANGELOG [TASK]: note recent upgrade of libdatrwxx

CHANGELOG

@@ -3,6 +3,12 @@ this is <CHANGELOG>
 Recent development in Seitosh (bug fixes, new features, etc)
 ------------------------------------------------------------
 
+06.07.2016 (4342d3a79): libdatrwxx provides new format modifiers
+
+  Format modifiers skipcheck and nonfatal which can be applied to the mseed
+  format provide user control over consistency checks to be applied to
+  MiniSEED data.
+
 27.06.2016 (7ffa0fa1d): libtfxx provides hexdump function
            (0d462617e): fix libdatrwxx