updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -37,6 +37,7 @@
   * [Perfectsquare](./Maths/PerfectSquare.php)
   * Projecteuler
     * [Problem1](./Maths/ProjectEuler/Problem1.php)
+    * [Problem10](./Maths/ProjectEuler/Problem10.php)
     * [Problem2](./Maths/ProjectEuler/Problem2.php)
     * [Problem3](./Maths/ProjectEuler/Problem3.php)
     * [Problem4](./Maths/ProjectEuler/Problem4.php)
@@ -45,7 +46,6 @@
     * [Problem7](./Maths/ProjectEuler/Problem7.php)
     * [Problem8](./Maths/ProjectEuler/Problem8.php)
     * [Problem9](./Maths/ProjectEuler/Problem9.php)
-    * [Problem10](./Maths/ProjectEuler/Problem10.php)
 
 ## Searches
   * [Binarysearch](./Searches/BinarySearch.php)