Fix assignment of age by making changing const to let

Author: MahirShah300

Sprint-2/2-mandatory-errors/1.js

@@ -1,6 +1,6 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
 
 //TypeError: Assignment to constant variable.