[eCash dev libraries] [p11 ecash-ops] Update ecash-minimaldata for correct dependencies
Summary:
T2847
Depends on D12867
Now that pushdata-ecash is published to npm, replace pushdata-bitcoin with pushdata-ecash in ecash-minimaldata
Update CHANGELOG.md, README.md, and references to dependencies in index.js
Test Plan: npm test
Reviewers: #bitcoin_abc, emack
Reviewed By: #bitcoin_abc, emack
Differential Revision: https://reviews.bitcoinabc.org/D12868