Fix missing "use" in PatternLab\Annotations

 - `PatternLab\Parsers\Documentation` needs a `use`

Author: Matthew Dev

src/PatternLab/Annotations.php

@@ -15,6 +15,7 @@
 use \PatternLab\Config;
 use \PatternLab\Console;
 use \PatternLab\Dispatcher;
+use \PatternLab\Parsers\Documentation;
 use \Symfony\Component\Yaml\Exception\ParseException;
 use \Symfony\Component\Yaml\Yaml;
 use \PatternLab\Timer;