Update README.md

Author: nolanlawson

README.md

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-express-pouchdb (repo moved)
+⚠️⚠️⚠️ THIS REPO HAS MOVED ⚠️⚠️⚠️
 =====
 
 As of [version 2.3.0](https://github.com/pouchdb/pouchdb-server/pull/168), `express-pouchdb` is now part of the [PouchDB Server](https://github.com/pouchdb/pouchdb-server) monorepo codebase. Please see [that repo](https://github.com/pouchdb/pouchdb-server) for documentation, tests, and code.
+
+This repo is left open so that folks can browse the old issues and PRs.