Added rebar to README.md

README.md

@@ -30,6 +30,7 @@ running TensorFlow 0.12 or earlier, please
 - [next_frame_prediction](next_frame_prediction): probabilistic future frame synthesis via cross convolutional networks.
 - [object_detection](object_detection): localizing and identifying multiple objects in a single image.
 - [real_nvp](real_nvp): density estimation using real-valued non-volume preserving (real NVP) transformations.
+- [rebar](rebar): low-variance, unbiased gradient estimates for discrete latent variable models.
 - [resnet](resnet): deep and wide residual networks.
 - [skip_thoughts](skip_thoughts): recurrent neural network sentence-to-vector encoder.
 - [slim](slim): image classification models in TF-Slim.