Update changedetection-v5-install.sh

add dnspython

install/changedetection-v5-install.sh

@@ -89,6 +89,7 @@ msg_ok "Installed Dependencies"
 msg_info "Installing Change Detection"
 mkdir /opt/changedetection
 $STD pip3 install changedetection.io
+$STD python3 -m pip install dnspython==2.2.1
 msg_ok "Installed Change Detection"
 
 msg_info "Creating Service"