Version 1.3, update Changelog.md

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 ## Upcoming Changes
 
+## Version 1.3
+
+Prevent `simplearchiver` from busy-waiting during non-blocking IO by sleeping
+in "EWOULDBLOCK" conditions. This results in less consumed cpu time by the
+process, especially during compression.
+
 ## Version 1.2
 
 Proper handling of Ctrl+C (SIGINT). This prevents temporary files from