update list of breaking changes in README

The README's list of breaking changes has fallen out of date. Fix that,
and thus fix #39. Thanks, @karlbecker!

CHANGELOG.md

@@ -1,7 +1,14 @@
 # Changelog
 
+We follow [semver]: the major version number will be upgraded with any
+breaking change. This changelog lists all meaningful changes in each
+release; consult the main [README] to determine which changes are
+breaking.
+
 ## 4.0.2 / Unreleased
 
+  * [[#39]] Bring list of breaking changes in the [README] up-to-date. Thanks, [@karlbecker]!
+
 ## 4.0.1 / 2016-10-24
 
   * expose additional `agent` properties through inheritance chain ([#38])
@@ -83,14 +90,19 @@ Thanks, [@srussellextensis]!
   * add changelog
   * initial commit
 
+[#39]: https://github.com/WhoopInc/supertest-as-promised/issues/39
 [#38]: https://github.com/WhoopInc/supertest-as-promised/issues/38
 [#34]: https://github.com/WhoopInc/supertest-as-promised/pull/34
 [#30]: https://github.com/WhoopInc/supertest-as-promised/issues/30
 [#23]: https://github.com/WhoopInc/supertest-as-promised/pull/23
 [#11]: https://github.com/WhoopInc/supertest-as-promised/pull/11
 
 [@bbatha]: https://github.com/bbatha
+[@karlbecker]: https://github.com/karlbecker
 [@mkasberg]: https://github.com/mkasberg
 [@jsdevwork]: https://github.com/jsdevwork
 [@srussellextensis]: https://github.com/srussellextensis
 [@sylvaingi]: https://github.com/sylvaingi
+
+[README]: README.md
+[semver]: http://semver.org

README.md

@@ -220,6 +220,10 @@ change. Breaking changes in each major version are listed below. Consult the
 [changelog] for a list of meaningful new features in each version; consult the
 commit log for a complete list.
 
+### Breaking changes in 4.0
+
+* In `.catch` handlers, `err.response` is now marked as non-enumerable.
+
 ### Breaking changes in 3.0
 
 * [Bluebird][bluebird] has been upgraded to version 3.3.1.