Fixed some trailing whitespace

$ shopt -s globstar
 $ sed -i 's/[ \t]*$//' src/pocketmine/*/**.php

:P

src/pocketmine/math/Vector3.php

@@ -163,7 +163,7 @@ class Vector3{
 
 	/**
 	 * Return a Vector3 instance
-	 * 
+	 *
 	 * @return Vector3
 	 */
 	public function asVector3() : Vector3{