Make conditional NodeJS 12+ compliant

[devinmatte]

Currently we can only run conditional on Node 8 and 10. But 10 is approaching end of life. We should try and bump out of date packages high enough to allow a 12.X compile

[sgreene570]

wasnt able to get gulp 4 working, godspeed to whoever tries next

Xref https://github.com/ComputerScienceHouse/conditional/tree/bump-build-deps

(feel free to delete that branch though)