fix: Update CHANGELOG for v1.16.0 to document bug fix for 2D output export to dataframes

Author: melund

CHANGELOG.md

@@ -1,5 +1,13 @@
 # AnyPyTools Change Log
 
+## v1.16.0
+
+**Fixed:**
+Fixed a bug when exporting output to pandas dataframes would not work correctly if the output was 2 dimensional.
+Now output is correctly converted to 1D arrays.
+I.e. similart to how 3D vectors are converted to 3 columns the rotation matrices are converted to 9 columns.
+
+
 ## v1.15.2
 
 **Fixed:**