[feat] Add new method to disconnect to redis

[lucas-m-ribeiro]

• Hello @nottyo, I would like to contribute to this pull request by implementing a new keyword for the redis library. This implementation will be responsible for safely disconnecting the database. This implementation resolves the reported issue No disconnect keyword #32 (comment)
  I hope that this contribution adds positively to the project and that everyone can benefit. I would like feedback on the implementation. I am available to answer any possible questions.

[leonpros]

change method name and keyword

[leonpros]

Looks good