Outdated example command line usage in README

```
> absorb schema kalshi
Usage: absorb [-h] {ls,info,collect,add,remove,path,cd,new,preview,sql,setup,validate,upload,download} ...
absorb: error: argument command: invalid choice: 'schema' (choose from ls, info, collect, add, remove, path, cd, new, preview, sql, setup, validate, upload, download)
```

```
> absorb collect kalshi
error: not enough values to unpack (expected 2, got 1)
```