Improvements
- [`b832f56`](https://github.com/jaedsonpys/cookiedb/commit/b832f56): Renaming "wrapper" function to "decorator";
- [`60d27d5`](https://github.com/jaedsonpys/cookiedb/commit/60d27d5): Renaming `CookieDB.get_opened_database` method to `checkout`;
- [`cdac90f`](https://github.com/jaedsonpys/cookiedb/commit/cdac90f): Removing `Union[str, int]` from writing and reading methods;
- [`6ec1aff`](https://github.com/jaedsonpys/cookiedb/commit/6ec1aff): Renaming `CookieDB.create_item` method to `add`;
- [`6be7f84`](https://github.com/jaedsonpys/cookiedb/commit/6be7f84): Renaming `CookieDB.get_item` method to `get`.