Changes:

* updated `shorter-js`
* documentation fixes for Twitter share link

Changes:

* Added rollup.polyfill.js for better polyfill management
* Updated the rollup.config.js
* Version Bump

Changes:

* removed some dependency on `shorter-js` for events and class manipulation
* code updates

Fixing some package.json

Update README.md

Changes:

* the script now requires `classList` polyfill for legacy browsers
* the constructor now exposes no public method
* major code cleanup