Remove extra new line in the generated Gemfile

Author: rafaelfranca

railties/lib/rails/generators/rails/app/templates/Gemfile.tt

@@ -2,7 +2,7 @@ source "https://rubygems.org"
 
 <%= gem_ruby_entry %>
 
-<% gemfile_entries.each do |gemfile_entry| %>
+<% gemfile_entries.each do |gemfile_entry| -%>
 <%= gemfile_entry %>
 <% end -%>
 <% unless options.minimal? -%>