Easily send a Tchap message from CLI

Related to Benjamin-Loison/matrix-commander/issues/32.

~/.bashrc:

send_tchap_message() {
    cd ~/Desktop/bens_folder/dev/tchap/tchapbot/
    python examples/send_simple_message.py '!OcVIxJjFFiGedWeTkH:agent.education.tchap.gouv.fr' "$1" &> /dev/null
    cd - > /dev/null
}

send_tchap_message 'so cool'

works fine.