Make parts of codebase more elixir'y

[techgaun]

There are parts of codes that would benefit from more Elixir style coding. This issue will serve as a ground for future PRs and commits for improving codebase quality

[axelson]

Did you have any parts in mind?

[techgaun]

@axelson ya like
https://github.com/techgaun/zxcvbn-elixir/blob/master/lib/zxcvbn/matching.ex#L358-L494
https://github.com/techgaun/zxcvbn-elixir/blob/master/lib/zxcvbn/scoring.ex#L142-L169

There're few places where I got anonymous functions within function body. I would prefer to extract them out to their own functions. Also, this one: #7 would be good to work on

Also, input from community would be good as feedback so this can get better in general