OMG THIS GAVE ME A HEADACHE... *coughs*
This update officially represents that Seasons is now compatible with 1.13 and above!
After many painstaking hours of smashing Maven together, the plugin will now detect your server version and adapt accordingly.
This means that this plugin runs on both Legacy (pre-1.13) and the new Modern (1.13+) spigot jars. Just pop it on your server and regardless of the server version, Seasons works!
Thank you to everyone who suggested updating to 1.13 - I may have already planned on it but I'm glad people liked the plugin enough to suggest it!
Note: 1.13 isn't currently the most stable of builds and Seasons might break on occasion. If you find a bug, please raise an issue on my GitHub and I will do my best to fix it. However, no guarantees can be made about how fast a fix can be made.