Few code standards. Remove composer vendor folder

solutions/other/sumdiv20.php

@@ -1,7 +1,7 @@
 <?php
 //Write a function to find the smallest number that is divisible by each of the numbers from 1 to 20.
 
-function sumdiv20() {
+function sumdiv20(): int {
     $i = 20;
     while(true) {
         $i += 20;