fix(rainbow change): the methods (bold & white) are not on String but Rainbow

Author: mmotherwell

lib/next_rails/bundle_report.rb

@@ -156,7 +156,7 @@ def output_to_stdout(out_of_date_gems, total_gem_count, sourced_from_git_count)
         header = "#{gem.name} #{gem.version}"
 
         puts <<-MESSAGE
-          #{Rainbow(header.bold.white)}: released #{gem.age} (latest version, #{gem.latest_version.version}, released #{gem.latest_version.age})
+          #{Rainbow(header).bold.white}: released #{gem.age} (latest version, #{gem.latest_version.version}, released #{gem.latest_version.age})
         MESSAGE
       end