README.md: fix typo
README.md: fix typo


DavidDurman/joint,clientIO/joint,kumilingus/joint,DavidDurman/joint,clientIO/joint,clientIO/joint,vtalas/joint,DavidDurman/joint,vtalas/joint,kumilingus/joint,kumilingus/joint,kumilingus/joint,vtalas/joint,clientIO/joint