Rakefile in wbench-0.2.3 vs Rakefile in wbench-0.3.0

@@ -1,9 +1,18 @@
 require 'bundler/gem_tasks'
+
+begin
+  require 'rspec/core/rake_task'
+  RSpec::Core::RakeTask.new(:spec)
+rescue LoadError
+  puts "rspec no available"
+end
+
+task :default => ['spec']