Update continuous integration

[alan-null]

Solution implemented here #32 no longer works due to old node version (node:8.2.1)

Build started
git config --global core.autocrlf true
git clone -q https://github.com/alan-null/sc_ext.git C:\projects\sc-ext
git fetch -q origin +refs/pull/148/merge:
git checkout -qf FETCH_HEAD
Running Install scripts
npm install -g npm
C:\Users\appveyor\AppData\Roaming\npm\npm -> C:\Users\appveyor\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js
C:\Users\appveyor\AppData\Roaming\npm\npx -> C:\Users\appveyor\AppData\Roaming\npm\node_modules\npm\bin\npx-cli.js
npm WARN notsup Unsupported engine for npm@8.19.[2](https://ci.appveyor.com/project/alannull/sc-ext#L2): wanted: {"node":"^12.1[3](https://ci.appveyor.com/project/alannull/sc-ext#L3).0 || ^1[4](https://ci.appveyor.com/project/alannull/sc-ext#L4).1[5](https://ci.appveyor.com/project/alannull/sc-ext#L5).0 || >=1[6](https://ci.appveyor.com/project/alannull/sc-ext#L6)"} (current: {"node":"8.1[7](https://ci.appveyor.com/project/alannull/sc-ext#L7).0","npm":"6.13.4"})
npm WARN notsup Not compatible with your version of node/npm: npm@[8](https://ci.appveyor.com/project/alannull/sc-ext#L8).1[9](https://ci.appveyor.com/project/alannull/sc-ext#L9).2
+ npm@8.19.2
added 211 packages from [10](https://ci.appveyor.com/project/alannull/sc-ext#L10)9 contributors in 5.347s
npm install
ERROR: npm is known not to run on Node.js v8.[17](https://ci.appveyor.com/project/alannull/sc-ext#L17).0
You'll need to upgrade to a newer Node.js version in order to use this
version of npm. You can find the latest version at https://nodejs.org/
Command exited with code 1