add changelog entry for 6.3 release (#6014)

Author: blink1073

CHANGELOG.md

@@ -12,6 +12,35 @@ upgrading `notebook`.
 Use `pip install pip --upgrade` to upgrade pip. Check pip version with
 `pip --version`.
 
+## 6.3.0
+
+### Merged PRs
+
+* Add square logo and desktop entry files [#6010](https://github.com/jupyter/notebook/pull/6010) ([@befeleme](https://github.com/befeleme))
+* Modernize Changelog [#6008](https://github.com/jupyter/notebook/pull/6008) ([@afshin](https://github.com/afshin))
+* Add missing "import inspect" [#5999](https://github.com/jupyter/notebook/pull/5999) ([@mgeier](https://github.com/mgeier))
+* Add Codecov badge to README [#5989](https://github.com/jupyter/notebook/pull/5989) ([@thomasrockhu](https://github.com/thomasrockhu))
+* Remove configuration for nosetests from setup.cfg [#5986](https://github.com/jupyter/notebook/pull/5986) ([@frenzymadness](https://github.com/frenzymadness))
+* Update security.rst [#5978](https://github.com/jupyter/notebook/pull/5978) ([@dlrice](https://github.com/dlrice))
+*  Docs-Translations: Updated Hindi and Chinese Readme.md [#5976](https://github.com/jupyter/notebook/pull/5976) ([@rjn01](https://github.com/rjn01))
+* Allow /metrics by default if auth is off [#5974](https://github.com/jupyter/notebook/pull/5974) ([@blairdrummond](https://github.com/blairdrummond))
+* Skip terminal tests on Windows 3.9+ (temporary) [#5968](https://github.com/jupyter/notebook/pull/5968) ([@kevin-bates](https://github.com/kevin-bates))
+* Update GatewayKernelManager to derive from AsyncMappingKernelManager [#5966](https://github.com/jupyter/notebook/pull/5966) ([@kevin-bates](https://github.com/kevin-bates))
+* Drop use of deprecated pyzmq.ioloop [#5965](https://github.com/jupyter/notebook/pull/5965) ([@kevin-bates](https://github.com/kevin-bates))
+* Drop support for Python 3.5 [#5962](https://github.com/jupyter/notebook/pull/5962) ([@kevin-bates](https://github.com/kevin-bates))
+* Allow jupyter_server-based contents managers in notebook [#5957](https://github.com/jupyter/notebook/pull/5957) ([@afshin](https://github.com/afshin))
+* Russian translation fixes [#5954](https://github.com/jupyter/notebook/pull/5954) ([@insolor](https://github.com/insolor))
+* Increase culling test idle timeout [#5952](https://github.com/jupyter/notebook/pull/5952) ([@kevin-bates](https://github.com/kevin-bates))
+* Re-enable support for answer_yes flag [#5941](https://github.com/jupyter/notebook/pull/5941) ([@afshin](https://github.com/afshin))
+* Replace Travis and Appveyor with Github Actions [#5938](https://github.com/jupyter/notebook/pull/5938) ([@kevin-bates](https://github.com/kevin-bates))
+* DOC: Server extension, extra docs on configuration/authentication. [#5937](https://github.com/jupyter/notebook/pull/5937) ([@Carreau](https://github.com/Carreau))
+
+### Contributors to this release
+
+([GitHub contributors page for this release](https://github.com/jupyter/notebook/graphs/contributors?from=2021-01-13&to=2021-03-18&type=c))
+
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+
 
 ## 6.2.0