Add a special `Mod` modifier that translates to either `Meta` on Mac or `Control` on other platforms #255

	name: Node CI

	on: [push, pull_request]
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Use Node.js 12.x
	uses: actions/setup-node@v1
	with:
	node-version: 12.x
	- name: npm install, build, and test
	run: \|
	npm install
	npm run build
	npm test
	env:
	CI: true

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