Rakefile in chatwork-0.5.0 vs Rakefile in chatwork-0.6.0

- old
+ new

@@ -1,9 +1,9 @@
 require "bundler/gem_tasks"
 
 begin
-  require 'rspec/core/rake_task'
+  require "rspec/core/rake_task"
   RSpec::Core::RakeTask.new
   task :default => :spec
 rescue
-  $stderr.puts('Install rspec')
+  warn("Install rspec")
 end