0.49.0 Small fixes as Semantic Versioning enforcement

What's Changed

• Re #2896 204 and other 20x responses are OK by @dgtlmoon in #2897
• Pin referencing library by @dgtlmoon in #2912
• 0.49.00 by @dgtlmoon in #2919

Full Changelog: 0.48.06...0.49.0