Add changelog entry

Author: krassowski

CHANGELOG.md

@@ -6,9 +6,11 @@
 
   - custom cell syntax highlighting is now properly removed when no longer needed ([#387])
   - the completer in continuous hinting now works well with the pasted text ([#389])
+  - continuous hinting suggestions will no longer show up if the only hint is the same as the current token ([#391])
 
 [#387]: https://github.com/krassowski/jupyterlab-lsp/issues/387
 [#389]: https://github.com/krassowski/jupyterlab-lsp/issues/389
+[#391]: https://github.com/krassowski/jupyterlab-lsp/issues/391
 
 ### `@krassowski/jupyterlab-lsp 2.0.7` (2020-09-18)