Allow Spree 4.5

Author: damianlegawiec

spree_auth_devise.gemspec

@@ -33,7 +33,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'devise', '~> 4.7'
   s.add_dependency 'devise-encryptable', '0.2.0'
 
-  spree_version = '>= 5.0.0.alpha'
+  spree_version = '>= 4.5.0.alpha'
   s.add_dependency 'spree_core', spree_version
   s.add_dependency 'spree_extension'