[DRE-maint] ruby-devise-two-factor is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-devise-two-factor 2.0.0-1 is marked for autoremoval from testing on 2016-07-24

It is affected by these RC bugs:
828169: ruby-devise-two-factor: FTBFS: attr_encrypted.rb:259:in `method_missing': undefined method `after_update' for TwoFactorAuthenticatableDouble:Class (NoMethodError)