Fix the JRuby version in `allow_failures` section of `.travis.yml`
Fix the JRuby version in `allow_failures` section of `.travis.yml`

This is a missing update of 0d56a311.

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