Add changelog note

Author: henrymercer

CHANGELOG.md

@@ -3,4 +3,5 @@
 ## [UNRELEASED]
 
 - Add this changelog file. [#507](https://github.com/github/codeql-action/pull/507)
-- Improve grouping of analysis logs. Add a new log group containing a summary of metrics and diagnostics, if they were produced by CodeQL builtin queries. [#515](https://github.com/github/codeql-action/pull/515)
+- Improve grouping of analysis logs. Add a new log group containing a summary of metrics and diagnostics, if they were produced by CodeQL builtin queries. [#515](https://github.com/github/codeql-action/pull/515)
+- Add metrics and diagnostics summaries from custom query suites to the analysis summary log group. [#532](https://github.com/github/codeql-action/pull/532)