message: eager: Update broken link in README
diff: @@ -35,7 +35,7 @@ print(m)
  This feature is in early stages and work remains to be done in terms of smooth
  support for distributed and multi-GPU training and CPU performance.
  -- [Known issues](https://github.com/tensorflow/tensorflow/issues?q=is%3Aissue%20is%3Aopen%20label%3Aproj%3Aeager)
  +- [Known issues](https://github.com/tensorflow/tensorflow/issues?q=is%3Aissue%20is%3Aopen%20label%3Acomp%3Aeager)
  - Feedback is welcome, please consider
  [filing an issue](https://github.com/tensorflow/tensorflow/issues/new) to provide it.
  