Updates and additions to release notes

Author: takluyver

docs/source/changelog.rst

@@ -28,20 +28,25 @@ We strongly recommend that you upgrade to version 9+ of pip before upgrading ``n
 
 New features:
 
-- Execute cells by clicking area in input prompt (:ghpull:`3535`, :ghpull:`3687`)
+- Execute cells by clicking icon in input prompt (:ghpull:`3535`, :ghpull:`3687`)
+- New "Save as" menu option (:ghpull:`3289`) 
 - Add kernel_info_timeout traitlet to enable restarting slow kernels (:ghpull:`3665`)
+- Add ``custom_display_host`` config option to override displayed URL (:ghpull:`3668`)
 - Add /metrics endpoint for Prometheus Metrics (:ghpull:`3490`)
 - Update to jQuery 3.3 (:ghpull:`3655`)
+- Update marked to 0.4 (:ghpull:`3686`)
 
 Fixing problems:
 
 - Don't duplicate token in displayed URL (:ghpull:`3656`)
 - Don't trash non-empty directories on Windows (:ghpull:`3673`)
 - Include LICENSE file in wheels (:ghpull:`3671`)
+- Don't show "0 active kernels" when starting the notebook (:ghpull:`3696`)
 
 Testing: 
+
 - Add find replace test (:ghpull:`3630`)
-- [3335] Convert JS tests to Selenium (:ghpull:`3601`)
+- Selenium test for deleting all cells (:ghpull:`3601`)
 
 Thanks to the following contributors: