Fix link

Author: gjbex

docs/README.md

@@ -58,7 +58,7 @@ Video recordings of this training are available on YouTube.
 1. [scikit-learn: classification and clustering](https://youtu.be/acXmk4Bx8pI) (12 minutes)
 1. [keras: introduction to neural networks](https://youtu.be/-CO0Y8wzYeI) (13 minutes)
 1. [keras: multilayer perceptrons for digit recognition](https://youtu.be/nAixWMYgzdo) (34 minutes)
-1. [keras: convolutional neural networks for digit recognition] (19 minutes)
+1. [keras: convolutional neural networks for digit recognition](https://youtu.be/L_2uTf24RiI) (19 minutes)
 1. [keras: recurrent neural networks for sentiment classification](https://youtu.be/TkafYl9APpM) (26 minutes)