Changed input range for the user.

Earlier the user had to enter the values for col and row in range 0-4, imho it is not a very user friendly design,
Now the user has to enter the values in the range 1-5 which get decremented, and the ship_row and ship_col values are also printed after incrementation, but the variables still store values of 0-4 range (because user input is decremented and then stored).

If you want to add this feature in your repository too, please accept this pull request.
Thank You! :smile: 

Contact me: me@jailuthra.in