Bump to v1.3.0, update changelog

[luandy64]

Description of change

This version ships both #96 and #97.

From #97:

• removes the "untestable streams" list from all tests.
• makes the test match the tap and expect the default page size to be 175, not 250
• adds bookmarking to order_refunds
• adds bookmarking to transactions
• adds shopify error handling to transactions
  • The tests would fail with unhandled 429s
• adds pagination to transactions

From #96:

• Update the API version from 2020-10 to 2021-04

QA steps

• automated tests passing
• manual qa steps passing (list below)

Risks

Rollback steps

• revert this branch