Fix: Require org-duration

This appears to be necessary on newer Org versions, but I don't know
exactly when.

org-ql.info

@@ -990,6 +990,8 @@ File: README.info,  Node: 063-pre,  Next: 062,  Up: Changelog
      (https://github.com/alphapapa/org-ql/issues/316).  Thanks to Akira
      Komamura (https://github.com/akirak) and Joon Ro
      (https://github.com/joonro) for reporting.)
+   • Require library ‘org-duration’ (apparently necessary in newer Org
+     versions).
 
 
 File: README.info,  Node: 062,  Next: 061,  Prev: 063-pre,  Up: Changelog
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