Fix missed link in compatibility section of readme.
@@ -88,7 +88,7 @@ versions.
TensorFlow Federated | TensorFlow
------------------------------------------------------------ | ----------
[master](https://github.com/tensorflow/federated) | [tf-nightly 1.x](https://pypi.org/project/tf-nightly/)
-[0.6.0](https://github.com/tensorflow/federated/tree/v0.5.0) | [tf-nightly 1.15.0.dev20190626](https://pypi.org/project/tf-nightly/1.15.0.dev20190626/)
+[0.6.0](https://github.com/tensorflow/federated/tree/v0.6.0) | [tf-nightly 1.15.0.dev20190626](https://pypi.org/project/tf-nightly/1.15.0.dev20190626/)
[0.5.0](https://github.com/tensorflow/federated/tree/v0.5.0) | [tf-nightly 1.14.1.dev20190528](https://pypi.org/project/tf-nightly/1.14.1.dev20190528/)
[0.4.0](https://github.com/tensorflow/federated/tree/v0.4.0) | [tensorflow 1.13.1](https://pypi.org/project/tensorflow/1.13.1)
[0.3.0](https://github.com/tensorflow/federated/tree/v0.3.0) | [tensorflow 1.13.1](https://pypi.org/project/tensorflow/1.13.1)
