chore(package.json) add engines parameter
chore(package.json) add engines parameter

- Add `engines` parameter to set Node.js version to use.
- This is required for 3rd party CI services.

More details:
- https://docs.npmjs.com/files/package.json
- https://github.com/codeship-library/nodejs-express-todoapp/blob/master/package.json

d2s/learning-stencil,d2s/learning-stencil,d2s/learning-stencil