4.2.0

What's Changed

• AP-282 fix expiration issue by @steve-sullivan in #4
• AP 475 SLF Changes by @steve-sullivan in #5
• Update version to 4.2.0 by @steve-sullivan in #6

Full Changelog: 4.0.0...4.2.0

v4.1.0: Fix token refresh logic

update cassettes

v4.0.0: Update to Worldcat API v2

AP-282: Worldcat/OCLC API version 2; update to token based authorization

v3.0.0: Allows for duplicate OCLC numbers

AP-214: Support duplicate OCLC Numbers