Docs: Update changelog

org-ql.info

@@ -859,7 +859,12 @@ File: README.info,  Node: 051-pre,  Next: 05,  Up: Changelog
 5.1 0.5.1-pre
 =============
 
-Nothing yet.
+*Fixed*
+   • Custom sorting functions could corrupt the cache, causing items to
+     disappear after refreshing an org-ql-search buffer.  (#186
+     (https://github.com/alphapapa/org-ql/issues/186), #187
+     (https://github.com/alphapapa/org-ql/issues/187).  Thanks to
+     Nathanael kinfe (https://github.com/natask).)
 
 
 File: README.info,  Node: 05,  Next: 049,  Prev: 051-pre,  Up: Changelog
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