Add changelog for 2.0.0a1 (#870)

CHANGELOG.md

@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 
 <!-- <START NEW CHANGELOG ENTRY> -->
 
+## 2.0.0a1
+
+([Full Changelog](https://github.com/jupyter-server/jupyter_server/compare/v2.0.0a0...v2.0.0a1)
+
+- Address security advisory [GHSA-q874-g24w-4q9g](https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-q874-g24w-4q9g).
+
+<!-- <END NEW CHANGELOG ENTRY> -->
+
 ## 2.0.0a0
 
 ([Full Changelog](https://github.com/jupyter-server/jupyter_server/compare/v1.16.0...3e64fa5eef7fba9f8e17c30cec688254adf913bd))
@@ -60,8 +68,6 @@ All notable changes to this project will be documented in this file.
 
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-<!-- <END NEW CHANGELOG ENTRY> -->
-
 ## 1.17.0
 
 ([Full Changelog](https://github.com/jupyter-server/jupyter_server/compare/v1.16.0...2b296099777d50aa86f67faf94d5cbfde906b169))