Added changes to the file

  1.added a guessing game to the program
As written, this code will run the `random_number` method each time you run through the loop, generating an entirely new random number each time. What you want to be doing is generating a random number **once**, and trying to guess it three times. Instead of the `random_number` method you have above, try doing this instead:
```ruby
random_number = rand(1..10)
```