rotate_backup 0.1.2

Rotate you backups easily
Documentation 
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# Simple utility to rotate backup files

Typical use:

```bash
ls *.tar | rotate_backup --output delete | xargs rm -f
```

# Providing the files

You can either provide files as argument or via `stdin`:

- `ls *.tar | rotate_backup --output delete | xargs rm -f` (requires `std` feature)
- `rotate_backup --output delete $(ls *.tar) | xargs rm -f`

# Selecting output

By default, only file to keep are shown (equivalent to `--output keep`).
Otherwise, you can use `--output delete`

# Date format

By default, the tool looks for this format: YYYY-mm-dd, but you can select a different format:
`rotate_backup --format "%Y%m%d"`
This will parse `20240213` for instance.

# Choosing how much logs are kept

The tool uses an exponential function based on days since the oldest backup.
This is inspired from [`frotate`](https://github.com/ip1981/frotate.rs)
You can choose the base for the exponent: `rotate_backup --base 1.2`.
Note that only `base > 1.0` are accepted.