Fighters.rb game/simulator (Ilja Goushcha)

Feel free to play it, but it is more of a simulator than a game. There is additional file, called fighters.rb, it shows that I know inheritance, but my main file is boxing.rb, it is an actual game/simulator
`for` is very rarely used in Ruby. It works, but just isn't very idiomatic. `each`, `times` and `upto` are more frequently used.