Update readme.md
Update readme.md

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