Systemd-networkd: Run script after DHCP client acquires new address

I am on ubuntu 18.04 server. I need to run a script that updates an IP address on CloudFlare (kind of DynDNS script). In previous versions I could do this with a DHCLIENT exit hooks for the interface enp1s0. However, systemd now uses their own build-in DHCP client. How can I write a systemd unit that executes my bash script as soon as a new IP address is provided to the DCHP client? Systemd is managing the interface enp1s0: #sudo systemctl status systemd-networkd ● systemd-networkd.service - Network Service Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled-runtime; vendor preset: enabled) Active: active (running) since Tue 2018-09-18 01:54:16 +08; 10h ago Docs: man:systemd-networkd.service(8) Main PID: 878 (systemd-network) Status: "Processing requests..." Tasks: 1 (limit: 4915) CGroup: /system.slice/systemd-networkd.service └─878 /lib/systemd/systemd-networkd Sep 18 01:54:27 xxx systemd-networkd: enp1s0: Configured