added another hard mode problem to loops-iterables-pt2
added another hard mode problem to loops-iterables-pt2

TIY-Houston-Front-End-Engineering/Course-Guide,TIY-Houston-Front-End-Engineering/Notes-Backbone-React-ES6,TIY-Houston-Front-End-Engineering/Notes-Backbone-React-ES6,TIY-Houston-Front-End-Engineering/Course-Guide,TIY-Houston-Front-End-Engineering/Course-Guide,TIY-Houston-Front-End-Engineering/Notes-Backbone-React-ES6