Nu Shell Updates: Math Command, Releases, and Scripting

1st chunk of `blog/2020-12-18-twin0069.md`

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# This week in Nu #69

- xolve added [`math abs` command](https://github.com/nushell/nushell/pull/2789)
- jonathandturner released [0.24.0](https://github.com/nushell/nushell/pull/2791) and [0.24.1](https://github.com/nushell/nushell/pull/2792)
- jonathandturner also landed the [big PR](https://github.com/nushell/nushell/pull/2795). This enables variables, custom commands, scopes, full scripting, and more. We'll be working on fixing issues ahead of the next release. If you're interested, please help us by testing it out before the release.
- fdncred added [showing trailing space as a different color](https://github.com/nushell/nushell/pull/2794)

Title: Nu Shell Updates: Math Command, Releases, and Scripting

Summary

This week's updates for Nu Shell include the addition of a `math abs` command, the release of versions 0.24.0 and 0.24.1, and the landing of a significant pull request enabling variables, custom commands, scopes, and full scripting. A new feature was also added to display trailing spaces in a different color.