Update "Has-One Associations" section in README [ci skip]
Fix PaperTrail initializer for setting console author [ci skip]

Without that change the initializer does not work.
It tries to find PaperTrail::Rails::Console
instead of Rails::Console
Merge remote-tracking branch 'kiela/master' [ci skip]
Clarify README instructions for usage of ProtectedAttributes with metadata [ci skip]