bubble_sort_by.rb

- [ ] bubble_sort_by method is implemented and working (Screenshot from Odin)
- [ ] sorts an array of numbers in increasing order
```ruby
unsorted = (1..10).to_a.reverse!
bubble_sort(unsorted) == unsorted.sort # should return true
```
- [ ] sorts an array by accepting a block
```ruby
unsorted = %w[hi hello hey]
bubble_sort_by(unsorted) { |left, right| left.length - right.length } == %w[hi hey hello] # should return true
```
- [ ] raises an error if block is not given
```ruby
bubble_sort_by(unsorted) == raise_error # should return true
```