added copyright notice and MIT license as a fallback

src/lib.rs

@@ -1,3 +1,11 @@
+/*
+   Copyright 2018 Ilya Epifanov
+
+   Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+   http://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.
+*/
 //#![deny(missing_docs)]
 #![deny(warnings)]
 #![feature(unsize)]