Add How to stop Puma on Heroku using plugins to the example directory
Add How to stop Puma on Heroku using plugins to the example directory

looker/puma,respire/puma,respire/puma,puma/puma,prathamesh-sonpatki/puma,eileencodes/puma,puma/puma,unleashed/puma,prathamesh-sonpatki/puma,prathamesh-sonpatki/puma,unleashed/puma,eileencodes/puma,ngpestelos/puma,prathamesh-sonpatki/puma,respire/puma,eileencodes/puma,looker/puma,respire/puma,eileencodes/puma,looker/puma,looker/puma,puma/puma,unleashed/puma,ngpestelos/puma,ngpestelos/puma,puma/puma,unleashed/puma,ngpestelos/puma