Add rspec-core to development dependencies, so bundle exec works when running tests
Add rspec-core to development dependencies, so bundle exec works when running tests

bonekost/mercury,bonekost/mercury,tcv-nguyen/spree-mercury,shilpi230/mercury,sarink/mercury,mervick/mercury,sarink/mercury,mediatainment/mercury,mediatainment/mercury,twistir/mercury_cms,shilpi230/mercury,mervick/mercury,bonekost/mercury,sr-education/mercury,shilpi230/mercury,mervick/mercury,twistir/mercury_cms,larquin/mercury,Senhordim/mercury,mediatainment/mercury,Senhordim/mercury,larquin/mercury,tcv-nguyen/spree-mercury,larquin/mercury,Senhordim/mercury,sarink/mercury,sr-education/mercury