fix 'Error: uninitialized constant Mercury::Engine' when running 'rails g mercury:install:authentication'
fix 'Error: uninitialized constant Mercury::Engine' when running 'rails g mercury:install:authentication'

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