Update README.md

README.md

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 link to event: https://www.meetup.com/ru-RU/St-Petersburg-R-User-Group/events/256745888/
 
-link to intaractive slides in web: https://metya.github.io/DeepLearning_in_R/index.html
+link to intaractive slides in web: https://metya.github.io/DeepLearning_in_R/
 
 files with code - [mxnet.R](https://github.com/metya/DeepLearning_in_R/blob/master/keras.R), [keras.R](https://github.com/metya/DeepLearning_in_R/blob/master/mxnet.R)