Switch to the MIT or Apache 2.0 license

opensmtpd-derive/src/lib.rs

@@ -1,3 +1,11 @@
+// Copyright (c) 2019 Rodolphe Bréard
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
 extern crate proc_macro;
 
 use proc_macro::TokenStream;