Update change log

Author: jim-easterbrook

CHANGELOG.txt

@@ -25,9 +25,10 @@ Changes in v0.18.0:
      aliases without the underscore.
   4/ Add data() method to exiv2.PreviewImage, deprecate pData() method.
   5/ Deprecated many BasicIo methods (read, write, seek, etc.) that should not
-     be needed in Python scripts. Let me know if this is a problem.
+     be needed in Python scripts. Please let me know if this is a problem.
   6/ Deprecated 'buffer interface' to BasicIo, DataBuf, and PreviewImage. They
      all have 'data()' to get their contents.
+  7/ Invalidate data iterators if data is deleted. (Requires swig >= 4.4)
 
 Changes in v0.17.3:
   1/ Binary wheels incorporate libexiv2 v0.28.5.