Update changelog

CHANGELOG.md

@@ -3,6 +3,8 @@
 ## [Unreleased]
 ### Added
 - Add the `IMGPROXY_MAX_REDIRECTS` config.
+- (pro) Add the `IMGPROXY_SERVER_NAME` config.
+- (pro) Add the `IMGPROXY_HEALTH_CHECK_MESSAGE` config.
 
 ## [3.2.2] - 2022-02-08
 ### Fix