Last round played reflects next round's pars

[Closes #5]
Main difference: ```times``` starts at 0.

```ruby
1.times do |num|
  puts num
end
# => 0

1.upto(1) do |num|
  puts num
end
# => 1
```

Not a huge difference, but since there's no hole zero, and I sorta wanted to do ```find_by(number: 1)``` later, I figured it'd be a decent change all around (and the ```num + 1``` folks use for ```times``` seems unnecessary if you just use ```upto```).