Gesetze

**Fixes**
* Fix `blockList` for function `linkify`
* Fix missing `\b` at end of regex

**Changes**
* Extend docs to include all available options

**Fixes**
* Fix regex for multiple section signs
* Fix option `blockList`

**Features**
* Add driver for `buzer.de`
* Add driver for `lexparency.de`

**Changes**
* Move function `buildTitle` to new trait `Title`
* Flatten `$matches` array
* Add test `testValidDriver`
* Extend & update docs

**Features**
* Add driver for `dejure.org`
* Add method `validate`
* Add manual override for HTML attributes

**Changes**
* Migrate to factory-like code
* Detect `Buchstabe` & `Buchst.`
* Add PHPDoc strings
* Update README

Initial release :tada: