Bump VS Code extension to 0.31.0

Summary: As per [instructions](https://www.internalfb.com/code/elp/src/fbsource/fbcode/whatsapp/elp/docs/meta_only/How-Tos/HowToReleaseELPonGitHub.md).

Reviewed By: jcpetruzza

Differential Revision: D65599297

fbshipit-source-id: 9dcf0ababcd66aa648b5e94b1e8ddb485bd435fb

Author: robertoaloi

editors/code/package-lock.json

@@ -3,7 +3,7 @@
   "description": "Erlang language server",
   "author": "Meta Platforms, Inc",
   "license": "Apache2",
-  "version": "0.30.0",
+  "version": "0.31.0",
   "icon": "images/elp-logo-color.png",
   "homepage": "https://whatsapp.github.io/erlang-language-platform/",
   "repository": {