add missing node LTS, latest stable and latest + VS2017 to appveyor.yml
add missing node LTS, latest stable and latest + VS2017 to appveyor.yml

justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs