Clarify that we use the Simplified BSD License

Simplified != FreeBSD, if we're being picky about it:

  https://spdx.org/licenses/

README.md

@@ -50,10 +50,9 @@ License
 -------
 
 The Hypothesis client is released under the [2-Clause BSD License][bsd2c],
-sometimes referred to as the "Simplified BSD License" or the "FreeBSD License".
-Some third-party components are included. They are subject to their own
-licenses. All of the license information can be found in the included
-[LICENSE][license] file.
+sometimes referred to as the "Simplified BSD License". Some third-party
+components are included. They are subject to their own licenses. All of the
+license information can be found in the included [LICENSE][license] file.
 
 [bsd2c]: http://www.opensource.org/licenses/BSD-2-Clause
 [license]: https://github.com/hypothesis/client/blob/master/LICENSE