added isSkill condition authored by Lxlp's avatar Lxlp
## Description
Checks the difference in y value (height) between the target entity and the caster.
## Attributes
| Attribute | Aliases | Description | Default |
|-----------|-----------|----------------------------------------------------------------------|---------|
| difference| diff, d | The y difference to check | |
## Examples
```yaml
TargetConditions:
- yDiff{diff=>5} true
```
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