README: Updated TravisCI link and image URL
README: Updated TravisCI link and image URL

kerel-fs/skylines,dkm/skylines,RBE-Avionik/skylines,kerel-fs/skylines,TobiasLohner/SkyLines,TobiasLohner/SkyLines,Turbo87/skylines,Turbo87/skylines,Harry-R/skylines,Turbo87/skylines,dkm/skylines,RBE-Avionik/skylines,skylines-project/skylines,shadowoneau/skylines,skylines-project/skylines,dkm/skylines,shadowoneau/skylines,TobiasLohner/SkyLines,dkm/skylines,Harry-R/skylines,shadowoneau/skylines,Turbo87/skylines,snip/skylines,skylines-project/skylines,Harry-R/skylines,skylines-project/skylines,shadowoneau/skylines,Harry-R/skylines,kerel-fs/skylines,snip/skylines,RBE-Avionik/skylines,RBE-Avionik/skylines,snip/skylines