README: Improve description
README: Improve description

onddo/ssh_authorized_keys-cookbook,acaiafa/ssh_authorized_keys-cookbook,Altiscale/ssh_authorized_keys-cookbook,acaiafa/ssh_authorized_keys-cookbook,mohitsethi/ssh_authorized_keys-cookbook,onddo/ssh_authorized_keys-cookbook,mohitsethi/ssh_authorized_keys-cookbook,mohitsethi/ssh_authorized_keys-cookbook,zuazo/ssh_authorized_keys-cookbook,Altiscale/ssh_authorized_keys-cookbook,zuazo/ssh_authorized_keys-cookbook,Altiscale/ssh_authorized_keys-cookbook,zuazo/ssh_authorized_keys-cookbook,acaiafa/ssh_authorized_keys-cookbook,onddo/ssh_authorized_keys-cookbook