Update README.md

Author: filipradenovic

README.md

@@ -22,7 +22,7 @@ This code implements:
 
 1. Training (fine-tuning) CNN for image retrieval
 1. Learning supervised whitening for CNN image representations
-1. Testing CNN image retrieval on Oxford5k and Paris6k datasets
+1. Testing CNN image retrieval on Oxford5k, Paris6k, R-Oxford5k, and R-Paris6k datasets
 
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