4.5.4

Merge pull request lob#185 from lob/release-v4.5.3

v4.5.3

Release v4.5.2 adds api keys per method and user-defined timeouts

Bump version: 4.5.0 → 4.5.1

[fix] Cards: Updated tests to reflect changed API contract (lob#175)

4.4.0

chore: bump version 4.0.2 -> 4.1.0 (lob#168)

* chore: fix ordering of self mailer in README API reference

* chore: bump version from 4.0.2 -> 4.1.0