License the project under MPL-2.0.

src/ping.rs

@@ -1,3 +1,10 @@
+// Copyright (c) 2017 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+// Copyright (c) 2017 Maxime “pep” Buquet <pep+code@bouah.net>
+//
+// 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/.
+
 use minidom::Element;
 
 use error::Error;