v0.13.1

What's Changed

• Make opentracing an optional dependency (faust[opentracing]) by @wbarnha in #686
• Remove dead opentracing reference from the confluent driver by @wbarnha in #685
• Harden reply-topic creation against a hardcoded replicas=0 by @wbarnha in #694
• Don't crash publishing on a non-bytes message key by @wbarnha in #695
• Add charset=utf-8 to JSON responses on the orjson (bytes) path by @wbarnha in #696
• Fix #433: allow test_context() for sink-less (non-yielding) agents by @wbarnha in #699
• Fix NotImplementedError on heterogeneous union model fields by @wbarnha in #747

Full Changelog: v0.13.0...v0.13.1