Add transpose and transverse

Added transpose: flip image vertically and rotate 90 degrees (http://imagemagick.org/script/command-line-options.php#transpose)
Added transverse: flop image horizontally and rotate 270 degrees (http://imagemagick.org/script/command-line-options.php#transverse)

Author: JeffAlyanak

Command.php

@@ -607,6 +607,26 @@ public function colorspace(string $colorspace): self
         return $this;
     }
 
+    /**
+     * @see http://imagemagick.org/script/command-line-options.php#transpose
+     */
+    public function transpose(): self
+    {
+        $this->command[] = '-transpose';
+
+        return $this;
+    }
+
+    /**
+     * @see http://imagemagick.org/script/command-line-options.php#transverse
+     */
+    public function transverse(): self
+    {
+        $this->command[] = '-transverse';
+
+        return $this;
+    }
+
     /**
      * /!\ Append a raw command to ImageMagick.
      * Not safe! Use at your own risks!