Upd changelog

diff --git a/ChangeLog-2.0.28 b/ChangeLog-2.0.28
index 50d0dfd4ffdd51561ca45df1f8f9930f44f8117e..4192c2735befbc84cf3d4e28c75dccd3d520ec5b 100644 (file)
--- a/ChangeLog-2.0.28
+++ b/ChangeLog-2.0.28
@@ -1 +1,4 @@
-  * Added filter options nan, inf and -inf for float series. (issue #97) 
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+  * Added filter options nan, inf and -inf for float series. (issue #97)
+  
+  * Handle invalid use of difference() and derivative() on log series 
+    correctly. (issue #98) 
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