1.9 / 1.12.2 support

[Dutchwilco]

Is your feature request related to a problem? Please describe. no

Describe the solution you'd like also support for 1.9 till 1.12.2

Describe alternatives you've considered x

Additional context Good guy!!!

[yannicklamprecht]

See old version:

Unsupported but working release:

• 1.8.8, 1.10.2, 1.11.2, 1.12.2, 1.13.2, 1.14.4, 1.15.2: https://github.com/yannicklamprecht/WorldBorderAPI/releases/tag/1.15.2

https://github.com/yannicklamprecht/WorldBorderAPI/tree/837a58e8c85f5572b46513c8f62a9f58b3a6f1bb