Recommend supertest for endpoint testing (#1170)

It now supports promises, see https://github.com/visionmedia/supertest/blob/master/History.md#200--2016-07-29

docs/recipes/endpoint-testing.md

@@ -2,7 +2,7 @@
 
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-AVA doesn't have a builtin method for testing endpoints, but you can use any assertion library with it. Let's use [`supertest-as-promised`](https://github.com/WhoopInc/supertest-as-promised).
+AVA doesn't have a builtin method for testing endpoints, but you can use any assertion library with it. Let's use [`supertest`](https://github.com/visionmedia/supertest).
 
 Since tests run concurrently, it's best to create a fresh server instance for each test, because if we referenced the same instance, it could be mutated between tests. This can be accomplished with a `test.beforeEach` and `t.context`, or with simply a factory function: