build(npm): update node compability up to `v8.x` (#358)
build(npm): update node compability up to `v8.x` (#358)

The supported version of node.js has been increased to v8.x by this commit.

Fixes #357
atscott/flex-layout,benbraou/flex-layout,angular/flex-layout,atscott/flex-layout,benbraou/flex-layout,atscott/flex-layout,angular/flex-layout,angular/flex-layout,benbraou/flex-layout,benbraou/flex-layout,angular/flex-layout,atscott/flex-layout