Update README.md

Author: adyyoung

README.md

@@ -34,7 +34,7 @@
 - [Utilities](#utilities)
     + [`likely`](#likely)
 - [Neural Network Types](#neural-network-types)
-    + [Why different Neural Network Types?](#why-different-neural-network-types-)
+    + [Why different Neural Network Types?](#why-different-neural-network-types)
 
 # Examples
 Here's an example showcasing how to approximate the XOR function using `brain.js`: