fix: Allow Supply 0 on Master Editions

[kespinola]

Issue

The current implementation does not support setting supply to 0 because 0 is falsy in javascript.

Changes

Replace accepting a number as a parameter with BN | null. The caller is responsible for setting it.

[austbot]

this is a great fix ill bring it in but not the package json changes

[austbot]

Thanks

[austbot]

@kespinola ill fix tests, in a diff branch unless you want to here

[kurpav]

@kespinola there are a few updates that need to be made to fix types form number to BN:

test/actions/mintEditionFromMaster.test.ts
test/actions/signMetadata.test.ts
test/actions/updateMetadata.test.ts

[kespinola]

@austbot @kurpav sorry for the crazy late delay. I have adjusted the test cases that were failing. We've also been using this version of the action for some time with no reported problems.

[aheckmann]

Thanks for this. Closing in favor of #147.

[kespinola]

Sounds good. Thank you.