Nushell Updates - Week #66

1st chunk of `blog/2020-11-27-twin0066.md`

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# This week in Nu #66

- smaydew added [`random decimal`](https://github.com/nushell/nushell/pull/2762)
- andrasio [fixed a `str substring` indexing issue](https://github.com/nushell/nushell/pull/2764)
- jonathandturner [fixed clippy warnings](https://github.com/nushell/nushell/pull/2760), [released 0.23](https://github.com/nushell/nushell/pull/2766), and has also been [working on the Nunu prototype](https://github.com/jonathandturner/nunu/commits/main) for future Nushell functionality
- efx [fixed a book typo](https://github.com/nushell/nushell.github.io/pull/69)

Title: Nushell Updates - Week #66

Summary

This week's updates to Nushell include adding a random decimal function, fixing a string substring indexing issue, resolving clippy warnings, releasing version 0.23, working on the Nunu prototype, and correcting a typo in the book.