update the changelog for v2.2.2

RadioAstronomySoftwareGroup · Sep 30, 2021 · f7e6133 · f7e6133
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -4,6 +4,7 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+## [2.2.2] - 2021-9-30
 
 ### Added
 - Added the `UVData.write_ms` method, a UVData measurement set writer.