Version 1.9, Update Changelog.md

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 ## Upcoming Changes
 
+## Version 1.9
+
 Add `file format 2` to handle archiving empty directories.
 
+Default file format is now `version 2`.
+
 Fix edge case where archiving only empty files breaks.  
 Currently archiving empty files with a compressor is broken. May not fix since
 a compressor is not needed if only empty files are archived.
 
+Add iterator for data structure priority heap.
+
 ## Version 1.8
 
 Minor refactorings related to `printf` and `uintX_t`/`size_t` types.