Rename repository to more constructive name

[davydovanton]

After #9 I thinking about rename this repository.

Pros

• less aggressive and more constructive for ecosystem

Cons

• less emotions -> will hard to invite a new folks (?)

[wuarmin]

Hey,
my proposals:

• active_support_replacements
• active_support_alternatives

I think lots of people will search for "active_support replacements" in future.

best regards