Version 3.4.0

We'd like to thank all the contributors who shaped up this huge release 👍

Features:

• Supports Spree 3.6 and Rails 5.2
• Support s Ruby 2.4 and 2.5
• Makes Devise validatable be configurable afb88d9

Fixes:

• Redirect to login page when unauthenticated visited authorization_failure 1150b41
• fix accesing env in metal decorator e1e83eb
• Fixes bypass sign_in deprecation warning 41e1038
• Fix user unloading in confirmation related specs c511d20
• Fix non-active product expectation 0423ad7
• Remove duplicate alert from log in form 1734c50
• fix password length regex, error message 60b455f
• Fix associating order to user problem due to new token 4454212
• Fixes order token cookies clear on logout [fixes #440] 828e7b9