add 1.4.0 changelog

Author: Zsailer

CHANGELOG.md

@@ -2,6 +2,24 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.4.0](https://github.com/jupyter-server/jupyter_server/tree/1.4.0) (2021-02-18)
+
+
+[Full Changelog](https://github.com/jupyter-server/jupyter_server/compare/1.3.0...HEAD)
+
+**Merged pull requests:**
+
+- Add Tests to Distribution [\#416](https://github.com/jupyter-server/jupyter_server/pull/416) ([afshin](https://github.com/afshin))
+- Enable extensions to control the file\_to\_run [\#415](https://github.com/jupyter-server/jupyter_server/pull/415) ([afshin](https://github.com/afshin))
+- add missing template for view.html [\#414](https://github.com/jupyter-server/jupyter_server/pull/414) ([minrk](https://github.com/minrk))
+- Remove obsoleted asyncio-patch fixture [\#412](https://github.com/jupyter-server/jupyter_server/pull/412) ([kevin-bates](https://github.com/kevin-bates))
+- Emit deprecation warning on old name [\#411](https://github.com/jupyter-server/jupyter_server/pull/411) ([fcollonval](https://github.com/fcollonval))
+- Correct logging message position [\#410](https://github.com/jupyter-server/jupyter_server/pull/410) ([fcollonval](https://github.com/fcollonval))
+- Update 1.3.0 Changelog to include broken 1.2.3 PRs [\#408](https://github.com/jupyter-server/jupyter_server/pull/408) ([kevin-bates](https://github.com/kevin-bates))
+- \[Gateway\] Track only this server's kernels [\#407](https://github.com/jupyter-server/jupyter_server/pull/407) ([kevin-bates](https://github.com/kevin-bates))
+- Update manager.py: more descriptive warnings when extensions fail to load [\#396](https://github.com/jupyter-server/jupyter_server/pull/396) ([alberti42](https://github.com/alberti42))
+
+
 ## [1.3.0](https://github.com/jupyter-server/jupyter_server/tree/1.3.0) (2021-02-04)
 
 [Full Changelog](https://github.com/jupyter-server/jupyter_server/compare/1.2.2...HEAD)