wip: start changelog entry for review

Author: jlengstorf

CHANGELOG.md

@@ -1,5 +1,22 @@
 # Changelog
 
+## 3.0.0 (2021-03-??)
+
+- feat: merge `next-on-netlify` into `@netlify/plugin-nextjs`
+  
+  This improves our ability to maintain the plugin, reduces confusion about how to configure Next.js support for Netlify builds, and prepares the plugin for something we're pretty dang excited about: automatic installation for new Next.js projects!
+
+> **NOTE: There are no breaking changes for existing plugin users.** This is a major release because we're bringing an external package into the plugin _and_ turning on automatic installation for new Next.js projects on Netlify. This doesn't break anything, but it's a big enough change that we wanted to treat it as a major release.
+
+### Migrating from v2 to v3
+
+If you've installed this plugin via Netlify's UI, no action is necessary. The upgrade is automatic.
+
+If you've installed this plugin manually in your `netlify.toml`, you can upgrade two ways:
+
+1. Use the new automatic install! Remove this plugin from your project and `netlify.toml` and Netlify will automatically install it for a seamless experience working with Next.js on Netlify.
+2. Manually update to the latest version using `npm i @netlify/plugin-nextjs@latest`.
+
 ## 2.0.1 (2021-02-17)
 
 - fail build if plugin cant load next.config.js ([#99](https://github.com/netlify/netlify-plugin-nextjs/pull/99))