Whoops, accidentally commited this new Sub type idea

tea.go

@@ -1,7 +1,6 @@
 package tea
 
 import (
-	"context"
 	"errors"
 	"io"
 	"os"
@@ -19,7 +18,7 @@ type Cmd func(Model) Msg
 
 // Sub is an event subscription. If it returns nil it's considered a no-op,
 // but there's really no reason to have a nil subscription.
-type Sub func(context.Context, Model) Msg
+type Sub func(Model) Msg
 
 // Subs is a keyed set of subscriptions. The key should be a unique
 // identifier; two different subscriptions should not have the same key