Deprecated bignumber dependency

[frbuceta]

Console Output
npm WARN deprecated bignumber.js@6.0.0: Custom ALPHABET bug fixed in v7.0.2

[dougwilson]

Thanks for the report @frbuceta 👍. I just looked through the change log between 6 and 7 and it looks like we can upgrade safely. I'll get a patch release of this module ready for release in a few hours.

[frbuceta]

Perfect ;) thanks

[dougwilson]

Published as 2.17.1