Nushell 0.3.0: Table Configuration, New File Formats, Commands, and Error Improvements

2nd chunk of `blog/2019-09-24-nushell_0_3_0.md`

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The table is also configurable. If you feel like the table is a bit too heavy, you can also configure it to work in light mode using this command:

```
> config --set [table_mode light]
```

## New file formats (pmeredit, est31, andrasio, sophiajt)

Nu now natively supports new file formats, including: bson, tsv, sqlite, and url-encoded strings.

## New commands (incrop, ramonsnir, ijt, sophiajt, andrasio, JonnyWalker81, chhetripradeep, pka)

Since the 0.2.0 release, Nu has gained a set of additional commands, including:

- `help` - built-in help system
- `reverse` - reverse a table
- `last` - like the `first` command, but working from the bottom of the table, return n rows
- `embed` - create a new table using the current table as a start
- `fetch` - get the contents of a URL (this originally lived in `open`)
- `post` - post to a URL and get the results
- `pwd` - print the working directory
- `env` - give access to a number of important paths and environment settings
- `pivot` - pivot a table so that rows become columns and vice-versa
- `echo` - a built-in echo command

## Error improvements (sophiajt)

Title: Nushell 0.3.0: Table Configuration, New File Formats, Commands, and Error Improvements

Summary

Nushell 0.3.0 introduces table configuration options, allowing users to switch to a 'light' mode. It also adds native support for new file formats like bson, tsv, sqlite, and URL-encoded strings. New commands like 'help', 'reverse', 'last', 'embed', 'fetch', 'post', 'pwd', 'env', 'pivot' and 'echo' have been added. Error messages have been improved to provide more helpful guidance.