message: chore(CI): watch scss files when building demo
diff: "docs:toc": "doctoc --title '**Table of Contents**' --maxlevel 4 ./README.md",
  "prebuild": "npm run clean:lib",
  "build": "node tooling/build.js",
  - "build:watch": "onchange 'src/lib/**/*.ts' -- npm run build",
  + "build:watch": "onchange 'src/lib/**/*.ts' 'src/lib/**/!(helpers).scss' -- npm run build",
  "build-demo": "cd src/demo && ng build --prod",
  "build-demo:watch": "cd src/demo && ng serve --port 4300",
  "build-scss": "node-sass src/lib -o src/lib --output-style expanded",
  