[ecashaddrjs] Update changelog for missed version numbers

Summary: Did not update the changelog for these minor version numbers. Should say something.

Test Plan: Proofread. 1.5.3 is D14676 and 1.5.4 is D15023

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D15399