Don't worry, unless if you have an extremely low par cpu, like under an i3, then it won't bottleneck your 1060. Plus unless if you constantly render videos, mulitask, record videos, and do all sorts of heavy CPU stuff on a constant basis, then your current i5 is perfectly fine.
Imho, going with a 1060 upgrade first, then an i7 upgrade would be more beneficial in gaming performance over an i7 first, then 1060.