Fix boolean types (#779)

Changed `Boolean` to `bool` to avoid Psalm being confused with a potential class.
Thanks @digilist

src/FFMpeg/Filters/Video/ResizeFilter.php

@@ -31,7 +31,7 @@ class ResizeFilter implements VideoFilterInterface
     private $dimension;
     /** @var string */
     private $mode;
-    /** @var Boolean */
+    /** @var bool */
     private $forceStandards;
     /** @var integer */
     private $priority;
@@ -69,7 +69,7 @@ class ResizeFilter implements VideoFilterInterface
     }
 
     /**
-     * @return Boolean
+     * @return bool
      */
     public function areStandardsForced()
     {

src/FFMpeg/Filters/Video/VideoFilters.php

@@ -31,7 +31,7 @@ class VideoFilters extends AudioFilters
      *
      * @param Dimension $dimension
      * @param string    $mode
-     * @param Boolean   $forceStandards
+     * @param bool   $forceStandards
      *
      * @return VideoFilters
      */