Added credits and license to readme
Added credits and license to readme

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