Generate suncalc.min.js.

Background: As you probably know I use this library in [opening_hours.js](https://github.com/ypid/opening_hours.js) (which works great by the way). I currently write an the Android application [ComplexAlarm](https://github.com/ypid/ComplexAlarm) which depends on opening_hours.js and thus also on suncalc. To execute JS on Android I use [js-evaluator-for-android](https://github.com/evgenyneu/js-evaluator-for-android) which requires a minified file.