process: Clarify wording of license information in README.

README.md

@@ -23,12 +23,20 @@ Next, add this to your crate:
 extern crate tokio_process;
 ```
 
+
 # License
 
-`tokio-process` is primarily distributed under the terms of both the MIT
-license and the Apache License (Version 2.0), with portions covered by various
-BSD-like licenses.
+Serde is licensed under either of
 
-See LICENSE-APACHE, and LICENSE-MIT for details.
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
 
+at your option.
 
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in Serde by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.