Update "OO input and output in Cactoos"

[filfreire]

The Cactoos usages of post https://github.com/yegor256/blog/blob/master/_posts/2017/jun/2017-06-22-object-oriented-input-output-in-cactoos.md need to be updated according to a recent Cactoos version.

[0crat]

@yegor256 please, pay attention to this issue

[yegor256]

@filfreire I don't think it's necessary, since it says in the beginning of the article that it's relevant only for a particular version of the library. Or you think I should update the article every time a new version of Cactoos is released?