Update CHANGELOG and README for ESM migration and copyright year change (#234)

Author: aeschli

CHANGELOG.md

@@ -1,4 +1,10 @@
 
+6.0.0-next.1 / 2026-03-04
+=================
+ * Breaking: Package is now ESM-only.
+ * Breaking: Removed UMD/CJS build outputs and legacy build scripts.
+ * Build/tooling: Migrated TypeScript project settings and source imports for NodeNext compatibility.
+
 5.6.0 / 2025-10-16
 ================
  * New settings `CompletionConfiguration.hideEndTagSuggestions`. If set, `doComplete` will not propose closing tags.

README.md

@@ -70,7 +70,7 @@ License
 
 (MIT License)
 
-Copyright 2016-2023, Microsoft
+Copyright 2016-2026, Microsoft
 
-`src/languageFacts/data/webCustomData.ts` (shipped as `lib/esm/languageFacts/data/webCustomData.ts`)
+`src/languageFacts/data/webCustomData.ts` (shipped as `lib/esm/languageFacts/data/webCustomData.js`)
 are built upon content from [Mozilla Developer Network](https://developer.mozilla.org/en-US/docs/Web) and distributed under CC BY-SA 2.5.