Update migrate docs

MIGRATE_FROM_V1.md

@@ -14,7 +14,12 @@ Multiple breaking changes were made to the API while creating version 2 of `twit
 - `Handler.VerifyChallenge` takes `context.Context`
 - `Handler.OnDuplicateNotification` takes `context.Context`
 - `Credientials` interface takes `context.Context`
+- Event handlers now have the following signature: 
+```go
+type EventHandler[EventMessage any] func(headers bindings.NotificationHeaders, sub bindings.Subscription, event EventMessage)
+```
 
 ## New:
 - `TrackerFunc` wrapper helper
 - `Handler` handler functions are now generated from the struct definition
+- `Handler` now has `BeforeHandleEvent` to trigger logic before dispatching the appropriate event handler

README.md

@@ -58,6 +58,10 @@ client.Subscribe(context.Background(), &eventsub.SubRequest{
 1. See [examples/sub_client/main.go](examples/sub_client/main.go) for an example usage of creating a new webhook subscription.
 2. See [examples/sub_handler/main.go](examples/sub_handler/main.go) for an example usage of receiving webhook notifications from Twitch.
 
+## Migrating to v2
+
+See [MIGRATE_FROM_V1.md](MIGRATE_FROM_V1.md) for details on the differences between v1 and v2.
+
 [doc-img]: https://pkg.go.dev/badge/github.com/dnsge/twitch-eventsub-framework/v2
 [doc]: https://pkg.go.dev/github.com/dnsge/twitch-eventsub-framework/v2
 [ci-img]: https://github.com/dnsge/twitch-eventsub-framework/actions/workflows/go.yml/badge.svg?branch=v2