Infinitely emiting both 'update' and 'complete' events

[panstav]

If you take the example code and run it with @0.1.1 you can see it's infinitely emiting both update and complete events.

Perhaps there's a if (this[SYMBOL_COMPLETED]) return; missing.

At first I wanted to PR a test to ensure that a Between instance that should run once would only emit the complete once and would not emit update afterwards, but was unsuccessful in running the tests locally. Would appreciate some help with that as well.

Thanks

[sasha240100]

@panstav Thanks for reporting! The codepen link returns 403 Error however, could you reupload it please?
UPD: Was able to use this link: https://codepen.io/panstav/pen/rrgzWK

[sasha240100]

Fixed in 043a9fa.

[panstav]

Perfect! Thanks a lot!