openSession :: String  -- ^ Hostname
            -> Integer -- ^ Port
            -> String  -- ^ Path to the known hosts (e.g. ~/.ssh/known_hosts)
            -> SimpleSSH Session
openSession hostname port knownhostsPath = openSession' hostname port $ Just knownhostsPath
openSession :: String  -- ^ Hostname
            -> Integer -- ^ Port
            -> String  -- ^ Path to the known hosts (e.g. ~/.ssh/known_hosts)
            -> SimpleSSH Session
openSession hostname port knownhostsPath = openSession' hostname port $ Just knownhostsPath
openSession hostname port knownhostsPath = openSession' hostname port $ Just knownhostsPath