v5.2.1

What's Changed

Improved chainable ResourcePromise interface for API resources.

• Add SugarClient tests by @eatyourgreens in #192
• Simplify chainable Resource.Promise promises by @eatyourgreens in #193
• Add Resource methods to ResourcePromise by @eatyourgreens in #195

Full Changelog: v5.2.0...v5.2.1