Deletes matching entries in maps or arrays.
## Examples
### Delete entry in map
Given a sample.yml file of:
```yaml
a: cat
b: dog
```
then
```bash
yq eval 'del(.b)' sample.yml
```
will output
```yaml
{a: cat}
```

### Delete entry in array
Given a sample.yml file of:
```yaml
- 1
- 2
- 3
```
then
```bash
yq eval 'del(.[1])' sample.yml
```
will output
```yaml
[1, 3]
```

### Delete no matches
Given a sample.yml file of:
```yaml
a: cat
b: dog
```
then
```bash
yq eval 'del(.c)' sample.yml
```
will output
```yaml
{a: cat, b: dog}
```