minor: Fix spelling error in readme.md
minor: Fix spelling error in readme.md

Signed-off-by: chuck-knox <db9491ce7c0251cad04215752f7f5527ef7bece4@gmail.com>

mssola/Portus,SUSE/Portus,SUSE/Portus,angry-tony/Portus-20170827,krishnak9/Portus,mssola/Portus,krishnak9/Portus,SUSE/Portus,krishnak9/Portus,angry-tony/Portus-20170827,mssola/Portus,SUSE/Portus,krishnak9/Portus,angry-tony/Portus-20170827,mssola/Portus,angry-tony/Portus-20170827