Nushell 0.22: Flatten Command and New Math Functions

2nd chunk of `blog/2020-11-03-nushell_0_22.md`

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_New flatten command_

There's now a flatten command that can take tables nested inside of the main table and flatten their contents into the main table.

### More `math` commands (morbatex, gillespiecd, fdncred)

You can now use rounding in math operations:

```
> echo [1.5 2.3 -3.1] | math ceil
───┬────
 0 │  2
 1 │  3
 2 │ -3
───┴────

> echo [1.5 2.3 -3.1] | math floor
───┬────
 0 │  1
 1 │  2
 2 │ -4
───┴────

Title: Nushell 0.22: Flatten Command and New Math Functions

Summary

The Nushell 0.22 release includes the addition of a `flatten` command, which can flatten nested tables into a single main table. Additionally, new math commands have been introduced, including `ceil` and `floor`, to enable rounding operations within math expressions. These commands are illustrated with examples showing how they operate on lists of numbers.