Updated readme to reflect linear-gradient
Updated readme to reflect linear-gradient

thoughtbot/bourbon,ismarkunc/bourbon,nagyistoce/sass-bourbon.io,Nikeshsuwal/bourbon,openeducation/bourbon,mindeavor/bourbon,san650/bourbon,smithdamen/bourbon,nickg33/bourbon,jamadam/bourbon-docs-jp,greyhwndz/bourbon,openeducation/bourbon,nickg33/bourbon,craftsmen/bourbon,thoughtbot/bourbon,jamesmenera/bourbon-libsass,Jazz-Man/bourbon,chriseppstein/bourbon,zyj1022/bourbon,jamadam/bourbon-docs-jp,mindeavor/bourbon,chriseppstein/bourbon,jasonwalkow/bourbon,zyj1022/bourbon,setie/bourbon,smithdamen/bourbon,jamadam/bourbon-docs-jp,craftsmen/bourbon,greyhwndz/bourbon,setie/bourbon,Jazz-Man/bourbon,jasonwalkow/bourbon,jamesmenera/bourbon-libsass,cllns/bourbon,jamadam/bourbon-docs-jp