Add Changelog entry for the icons

Author: krassowski

CHANGELOG.md

@@ -7,6 +7,7 @@
   - support for JupyterLab 2.2 ([#301][])
   - completer now displays server-provided documentation,
     and a kernel icon for kernel suggestions without type information ([#301][])
+  - add two icons themes for the completer (material and vscode) ([#322])
   - the documentation by the completer can be turned on or off ([#315])
   - continuous hinting (Hinterland mode) can be enabled in settings ([#315])
   - tokens in which the completer should not be triggered can be changed ([#315])
@@ -32,6 +33,7 @@
 [#301]: https://github.com/krassowski/jupyterlab-lsp/pull/301
 [#315]: https://github.com/krassowski/jupyterlab-lsp/pull/315
 [#318]: https://github.com/krassowski/jupyterlab-lsp/pull/318
+[#322]: https://github.com/krassowski/jupyterlab-lsp/pull/318
 [00448d0]: https://github.com/krassowski/jupyterlab-lsp/pull/318/commits/00448d0c55e7f9a1e7e0a5322f17610daac47dfe
 [bacc006]: https://github.com/krassowski/jupyterlab-lsp/pull/318/commits/bacc0066da0727ff7397574914bf0401e4d8f7cb
 [4e5b2ad]: https://github.com/krassowski/jupyterlab-lsp/pull/318/commits/4e5b2adf655120458cc8be4b453fe9a78c98e061