Update README.md

Removed invalid links.

Author: beNative

README.md

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 A collection of notebooks demonstrating basic Python language features and packages for personal reference.
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-- [Python basics](https://github.com/beNative/jupyter_examples/blob/5dd4a70e9b360cccfc4517c811eaf6272c16358d/Python%20basics.ipynb)
-- [Comprehensions](Comprehensions.ipynb)
-- [Pattern matching](https://github.com/beNative/jupyter_examples/blob/7cdf087c9defe5fa0cc26159dd4f14b585f6600e/Pattern%20matching.ipynb)
-- [Rich showcase](Rich%20showcase.ipynb)