(new): support Bot API 10.3

(fix): finalize v2 contracts
(tests): cover v2 migration
(doc): prepare release guidance

tgfmt/message_builder.go

@@ -5,7 +5,7 @@ import (
 	"time"
 
 	"git.scuroneko.dev/scuroneko/extypes"
-	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/v2/tgapi"
 )
 
 // MessageBuilder builds Telegram message text with explicit message entities.

tgfmt/message_builder_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 	"time"
 
-	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/v2/tgapi"
 )
 
 func TestMessageBuilder_BuildPlainText(t *testing.T) {