Update deps

[achingbrain]

Also fixes #22 as whatever this module depended on that depended on left-pad no longer depends on left-pad.

[vweevers]

See the caveat here: https://github.com/Level/level-js/blob/master/UPGRADING.md#500

[achingbrain]

Which caveat do you mean? We're going from 5.x.x to 6.x.x - I didn't see anything specific about that in UPGRADING.md

[vweevers]

IIRC y'all are using level in the browser too, right? So:

Existing IndexedDB databases created with level-js@4 can be read only if they used binary keys and string or binary values. Other types will come out stringified, and string keys will sort incorrectly. Use the included upgrade() utility to convert stored data to binary (in so far the environment supports it):

[achingbrain]

Aha, thanks for the clarification. This would also have been a problem with the previous dependency on level@5.0.1 though, correct?

[vweevers]

This would also have been a problem with the previous dependency on level@5.0.1 though, correct?

No. I think we're mixing up level and level-js.