Update changelog

Signed-off-by: Mateusz Szczygieł <[email protected]>

Author: matszczygiel

changelog.md

@@ -6,6 +6,7 @@ This means the whole API has changed. Even though semantics are the same
 the mechanism is now different and requires new implementation to use properly.
 * Split checksum events into finalize and verify
 * Add `base_dir` field in the `RequestQueued` event files
+* Fix rare issue of missing receiver's in-progress events
 
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