Update README.md

Author: findmyway

README.md

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 This repo contains most of the reinforcement learning environments referred in the book [Reinforcement Learning: An Introduction(2nd)](http://incompleteideas.net/book/the-book-2nd.html). You may also view the notebooks bellow for how to reproduce most of the figures on that book:
 
-- [View on Nextjournal](https://nextjournal.com/Jun-Tian/notebooks-for-reinforcementlearninganintroductionjl)
 - [View on Jupyter NBViewer](https://nbviewer.jupyter.org/github/JuliaReinforcementLearning/ReinforcementLearningAnIntroduction.jl/tree/master/notebooks/)
 - [View on Github](https://github.com/JuliaReinforcementLearning/ReinforcementLearningAnIntroduction.jl/tree/master/notebooks)
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