spdx (#581)

Co-authored-by: techknowlogick <hello@techknowlogick.com>
Co-committed-by: techknowlogick <hello@techknowlogick.com>

cmd/flags/issue_pr.go

@@ -1,6 +1,5 @@
 // Copyright 2019 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package flags