[develop-v3] $fw/version is reported as "(null)"

[CWempe]

I just tried the example sketch on my Wemos D1 mini pro.

And I noticed $fw/version is reported as (null).

 homie/sideboard/$state init
 homie/sideboard/$homie 3.0.1
 homie/sideboard/$name sideboard
 homie/sideboard/$mac 5C:CF:7F:D9:7E:FC
 homie/sideboard/$localip 192.168.1.46
 homie/sideboard/$nodes light
 homie/sideboard/$stats uptime
 homie/sideboard/$stats/interval 65
 homie/sideboard/$fw/name awesome-relay
 homie/sideboard/$fw/version (null)
 homie/sideboard/$fw/checksum df31b55fef6b3c2ba242494e25151d11
 homie/sideboard/$implementation esp8266
 homie/sideboard/$implementation/config {"wifi":{"ssid":"CWempe"},"mqtt":{"host":"192.168.1.140","port":1883,"auth":true},"name":"sideboard","ota":{"enabled":true},"device_id":"sideboard"}
 homie/sideboard/$implementation/version 3.0.0
 homie/sideboard/$implementation/ota/enabled true

This may be related to #597.

[CWempe]

I found the problem.
https://github.com/homieiot/homie-esp8266/blob/develop-v3/examples/LightOnOff/LightOnOff.ino#L3

There must not be a semicolon after a #define statement. (see https://www.arduino.cc/reference/en/language/structure/further-syntax/define/)