DOC Mention interval-int

This should not be visible in results, but should result in better performance.
ngless-toolkit · Feb 9, 2021 · d580ac4 · d580ac4
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commit d580ac4
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diff --git a/docs/sources/whatsnew.rst b/docs/sources/whatsnew.rst
@@ -18,6 +18,10 @@ User-visible improvements
 Internal improvements
 ~~~~~~~~~~~~~~~~~~~~~
 
+- Switched internal interval structure to `interval-int
+  <https://github.com/ngless-toolkit/interval-to-int/>`__. For users using
+  GFF-style annotation in ``count()``, this should result in a significant
+  improvement (less memory, faster performance)
 - Use zstd compression for more temporary files
 
 Bugfixes