Edit rackup start command to rackup -s Puma.
Edit rackup start command to rackup -s Puma.

Steps to reproduce:
1. Create config.ru. (http://guides.rubyonrails.org/v2.3.11/rails_on_rack.html#rackup)
2. rackup -s puma

Expected Result:
Application runs with puma as it's web server.

Actual Result:
.bundle/gems/rack-1.1.6/lib/rack/handler.rb:21:in `const_get': wrong constant name puma (NameError)

Solution:
Start with rackup -s Puma, NOT rackup -s puma.
jbmyid/puma,unleashed/puma,arturocadena/puma,wallclockbuilder/puma,eileencodes/puma,looker/puma,matthewd/puma,nathansamson/puma,respire/puma,tuvistavie/puma,BenV/puma,nathansamson/puma,snow/puma,snow/puma,prathamesh-sonpatki/puma,tuvistavie/puma,jbmyid/puma,looker/puma,respire/puma,zBMNForks/puma,arturocadena/puma,costi/puma,kyledrake/puma,jc00ke/puma,tuvistavie/puma,jc00ke/puma,unleashed/puma,nathansamson/puma,BenV/puma,unleashed/puma,kyledrake/puma,ngpestelos/puma,zBMNForks/puma,matthewd/puma,kyledrake/puma,prathamesh-sonpatki/puma,respire/puma,tuvistavie/puma,puma/puma,matthewd/puma,ngpestelos/puma,prathamesh-sonpatki/puma,jc00ke/puma,puma/puma,zapnap/puma,matthewd/puma,puma/puma,zBMNForks/puma,eileencodes/puma,nathansamson/puma,wallclockbuilder/puma,eileencodes/puma,costi/puma,arturocadena/puma,snow/puma,zBMNForks/puma,jbmyid/puma,jc00ke/puma,ngpestelos/puma,prathamesh-sonpatki/puma,jbmyid/puma,zapnap/puma,eileencodes/puma,costi/puma,unleashed/puma,wallclockbuilder/puma,wallclockbuilder/puma,zapnap/puma,looker/puma,looker/puma,respire/puma,costi/puma,snow/puma,arturocadena/puma,puma/puma,ngpestelos/puma,BenV/puma,BenV/puma,zapnap/puma,kyledrake/puma