Do you have any plans to update to v3.7?

I do but I would like to wait until 3.7 is a bit more stable. I would have liked to make it compatible with 3.6 and 3.7 but there is a breaking change in 3.7 that stops this.

I have just submitted an update to the code that allow you to build a version that is compatible with WiX 3.7.

An update to support WiX 3.7 has now been released.