spree/spree — pull request #5707 by tomash (2014-12-04 14:58:46+00:00)
Title: 2.4 upgrade guides now correctly suggest Rails 4.1.8 version

Spree 2.4 upgrade guides state that Rails 4.1.6 is the minimal version while gemspec of spree_core in current 2-4-stable branch depends on 4.1.8. Changed the upgrade guides to reflect that.