Fix nl2br configuration feature

| Q             | A
| -------------:| ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #83
| License       | MIT

Line breaks Decoda configuration was [added since version 6.2.0](https://github.com/milesj/Decoda/compare/6.1.0...6.2.0) and configurable with the [`Decoda::setLineBreaks()`](https://github.com/milesj/Decoda/blob/6.2.0/src/Decoda/Decoda.php#L808).