Update README.md

Author: taolei87

README.md

@@ -53,13 +53,14 @@ output, hidden = rnn(x)      # forward pass
  - machine translation
  - speech recognition
 
-
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 ## Contributors
 -  **Tao Lei** ([email protected])
 -  **Yu Zhang** ([email protected])
 
+<br>
+
 ## To-do
   - [ ] ReLU activation
   - [ ] Layer normalization + residual to compare with highway connection (current version)