rails_5.2.gemfile in shortener-0.8.1

- old
+ new

@@ -1,7 +1,7 @@
 # This file was generated by Appraisal
 
 source "http://rubygems.org"
 
-gem "rails", "5.2.0"
+gem "rails", "~> 5.2.0"
 
 gemspec path: "../"