Вычислитель отличий

Hexlet tests and linter status:

Demo JSON: https://asciinema.org/a/A2WjQlKrWXIYBW2RBVuaMk9Qa
Demo YAML: https://asciinema.org/a/XPEdyppUgdjXBOkbvg2CMr0Wk
Demo plain formatter: https://asciinema.org/a/g3yR6JapDhaqnkOwmgJmjZZgn
Demo json formatter: https://asciinema.org/a/EbY8i1vLe7tDs5PUezMyBREEB