Update linear_search.js

Author: nersus15

src/algorithms/search/linear_search.js

@@ -1,9 +1,7 @@
-const linearSearch = function(arr, val) {
+const linearSearch = (arr, val)=> {
     for (let i = 0; i < arr.length; i++ ) {
-        if (arr[i] == val) {
-            return i;
-        }
+        if (arr[i] == val) return i;
     }
     return -1;
-}
+};
 module.exports = linearSearch;