Revert "bump node-sass@4 & gulp-sass@3 (#30)"
Revert "bump node-sass@4 & gulp-sass@3 (#30)"

This reverts commit 7e2ac3d4981d0fda3a622cd8ad124e85c870ce2b.

kupriyanenko/wix-node-build,kupriyanenko/wix-node-build