Doesn't build properly on Node11

[meeh0w]

We're using wdio-sync@0.7.2, which in turn uses fibers@2.0.2, which doesn't build properly on Node11. Fibers@3.0.0 builds just fine on Node11.

However, I noticed that wdio-sync is a part of webdriverio-boneyard - is there anything we can do about this, then?

[christian-bromann]

Fibers@3.0.0 builds just fine on Node11.

Thanks I will make sure to update the dependency