Lastest update causes errors with build version

[WilliamLumsden]

Hello,

The latest update kept the v0.15 release tag. This can and has caused errors in other projects that use ImPlot.

I suggest updating the current version to v0.16 and restoring the v0.15 tag to its previous position.

Thanks!

[epezent]

https://github.com/epezent/implot/releases/tag/v0.16