CHANGELOG [DOC]: advertise recently added features

CHANGELOG

@@ -3,6 +3,11 @@ this is <CHANGELOG>
 Recent development in Seitosh (bug fixes, new features, etc)
 ------------------------------------------------------------
 
+08.04.2019: libpsdxx, croposp
+  - commit ac21043: croposp provide option to average complex values
+  - commit 5f268ba: libpsdxx provides additional function to map complex
+                    values to sampling along logarithmic frequency scale
+
 02.04.2019: libtsioxx
 !!- commit eb0f2182: bug fix and major modification in source code interface
                      (organization of header files)