update changelog for 3.0.8

docs/source/getting_started/changelog.rst

@@ -10,6 +10,15 @@ See the `JupyterLab
 3.0 <https://github.com/jupyterlab/jupyterlab/milestone/48?closed=1>`__
 milestone on GitHub for the full list of pull requests and issues closed.
 
+v3.0.8
+^^^^^^
+* Add hash to webpack requests to enable caching.  (`#9776 <https://github.com/jupyterlab/jupyterlab/pull/9776>`__)
+* Update MANIFEST.in to include package_data files.  (`#9780 <https://github.com/jupyterlab/jupyterlab/pull/9780>`__)
+* Correct synchronization of tags between metadata and tags widget.  (`#9773 <https://github.com/jupyterlab/jupyterlab/pull/9773>`__)
+* Fix use of hyphen in module name.  (`#9655 <https://github.com/jupyterlab/jupyterlab/pull/9655>`__)
+* Add missing default_url fields to more examples.  (`#9737 <https://github.com/jupyterlab/jupyterlab/pull/9737>`__)
+* Add missing default_url fields to examples.  (`#9731 <https://github.com/jupyterlab/jupyterlab/pull/9731>`__)
+
 v3.0.7
 ^^^^^^
 * Add link for prebuilt extensions too.  (`#9702 <https://github.com/jupyterlab/jupyterlab/pull/9702>`__)