v0.20.0

Semantic Conventions

• Change default stability level to experimental by @arminru in #189
• fix f string in semantic_convention.py by @zeitlinger in #185

Semantic Conventions Schema Tool

• No changes

Protobuf

• No changes

Other

• Bump github.com/stretchr/testify from 1.8.3 to 1.8.4 in /schemas by @dependabot in #180
• Add semantic convention approvers to CODEOWNERS by @arminru in #179

New Contributors

• @zeitlinger made their first contribution in #185

Full Changelog: v0.19.0...v0.20.0