Adding a note about Node.js update (to version 14.18.1) into change-log.

Author: iamstolis

CHANGELOG.md

@@ -3,6 +3,9 @@
 This changelog summarizes major changes between GraalVM versions of the GraalVM JavaScript (ECMAScript) language runtime.
 The main focus is on user-observable behavior of the engine.
 
+## Version 21.3.1
+* Updated Node.js to version 14.18.1.
+
 ## Version 21.3.0
 * Implemented the [Private Fields in `in`](https://tc39.es/proposal-private-fields-in-in) proposal. It is available behind the experimental option `--js.private-fields-in`. 
 * Implemented the [JavaScript BigInt to WebAssembly i64 integration](https://github.com/WebAssembly/JS-BigInt-integration) proposal. It can be disabled using the `--js.wasm-bigint=false` option.