Fix: No cmd option specified, unable to run specs!

Author: sueyoshi_go

Guardfile

@@ -1,6 +1,6 @@
 
 
-guard 'rspec' do
+guard 'rspec', cmd: 'bundle exec rspec' do
   watch(%r{^spec/.+_spec\.rb$})
   watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
   watch('spec/spec_helper.rb')  { "spec" }