Add changelog note

Author: aeisenberg

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - The `init` step of the Action now supports `ram` and `threads` inputs to limit resource use of CodeQL extractors. These inputs also serve as defaults to the subsequent `analyze` step, which finalizes the database and executes queries. [#738](https://github.com/github/codeql-action/pull/738)
 - When used with CodeQL 2.7.1 or above, the Action now includes custom query help in the analysis results uploaded to GitHub code scanning, if available. To add help text for a custom query, create a Markdown file next to the `.ql` file containing the query, using the same base name but the file extension `.md`. [#804](https://github.com/github/codeql-action/pull/804)
+- The `upload-sarif` action now allows multiple uploads in a single job, as long as they have different categories. [#801](https://github.com/github/codeql-action/pull/801)
 
 ## 1.0.21 - 28 Oct 2021