rails_5.1.gemfile in slim-rails-3.3.0

- old
+ new

@@ -1,7 +1,8 @@
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
 
 gem "rails", "~> 5.1.0"
+gem "sprockets", "~> 3.7"
 
 gemspec path: "../"