Setup rule related to indent on string concat

This should be a linting error, but is not with current linting rules.
```
        if(!currentCapabilityExpirationDate ||
          currentCapabilityExpirationDate > parentExpirationDate) {
          throw new Error('The `expires` property in a delegated ' +
          'capability must be equivalent or more restrictive than its ' +
          'parent.');
        }
```