Update README.md

Fix a broken link

research/slim/README.md

@@ -15,7 +15,7 @@ data reading and queueing utilities. You can easily train any model on any of
 these datasets, as we demonstrate below. We've also included a
 [jupyter notebook](https://github.com/tensorflow/models/blob/master/research/slim/slim_walkthrough.ipynb),
 which provides working examples of how to use TF-Slim for image classification.
-For developing or modifying your own models, see also the [main TF-Slim page](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/contrib/slim).
+For developing or modifying your own models, see also the [main TF-Slim page](https://github.com/tensorflow/models/tree/master/research/slim).
 
 ## Contacts