v0.4.1

To allow merging arrays and objects via expansion, trailing comma after `s` and
`q` will be auto removed after the expansion if no value is passed for the
placeholder.

Example:

```bash
jf "[%(a)*s, %(b)*s]" b=2 b=1
[2,1]

jf "{%(a)**s, %(b)**s}" b=2 b=1
{"2":1}
```