update release version number and changelog

Author: hkong

ChangeLog.md

@@ -1,6 +1,9 @@
 # Change Log
 
-### 2.2.0-rc4 (Sprint 5)
+### 2.2.0 - deployed 2026-05-12
+  - cve-core as npm package used directly from github using `"cve-core": "github:CVEProject/cve-core.git#dev"` in `package.json`
+
+ ### 2.2.0-rc4 - deployed 2025-10-20 on AWS for search
   - exact phrase search using double quotes
   - date and date range search on date fields, using the following formats (date ranges are inclusive):
     - YYYY-MM-DD