Meta: update repository files

See https://github.com/whatwg/spec-factory for details.

Author: annevk

PULL_REQUEST_TEMPLATE.md

@@ -11,5 +11,7 @@ Thank you for contributing to the Encoding Standard! Please describe the change
    * Chrome: …
    * Firefox: …
    * Safari: …
+   * Deno: …
+   * Node.js: …
 
 (See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)