Drop support for ActiveRecord 2?

[tilsammans]

Do you have plans to drop support for ActiveRecord 2.x? It's so old and not supported by the vendor.

I am asking because acts_as_xlsx is printing deprecation notices on Rails 4. I want to submit a pull request, but before I fix it by switching on ActiveRecord version, you might want to consider dropping support for 2.x.

Calling #find(:all) is deprecated. Please call #all directly instead.