minidom: add license headers

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

minidom-rs/src/error.rs

@@ -1,3 +1,14 @@
+// Copyright (c) 2020 lumi <lumi@pew.im>
+// Copyright (c) 2020 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+// Copyright (c) 2020 Bastien Orivel <eijebong+minidom@bananium.fr>
+// Copyright (c) 2020 Astro <astro@spaceboyz.net>
+// Copyright (c) 2020 Maxime “pep” Buquet <pep@bouah.net>
+// Copyright (c) 2020 Matt Bilker <me@mbilker.us>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 //! Provides an error type for this crate.
 
 use std::convert::From;