Update pxssh example for Python 3
Update pxssh example for Python 3

quatanium/pexpect,quatanium/pexpect,bangi123/pexpect,Wakeupbuddy/pexpect,blink1073/pexpect,Depado/pexpect,dongguangming/pexpect,blink1073/pexpect,bangi123/pexpect,Wakeupbuddy/pexpect,nodish/pexpect,dongguangming/pexpect,Depado/pexpect,crdoconnor/pexpect,bangi123/pexpect,Wakeupbuddy/pexpect,crdoconnor/pexpect,nodish/pexpect,Depado/pexpect,dongguangming/pexpect,crdoconnor/pexpect,blink1073/pexpect,nodish/pexpect,Wakeupbuddy/pexpect,Depado/pexpect,dongguangming/pexpect,quatanium/pexpect,bangi123/pexpect