0.13.0

What's Changed

• ci: Switching to staging by @ptiurin in #216
• ci: Switch back to username password auth by @ptiurin in #217
• build: Switch to github flake8 repo by @ptiurin in #218
• docs: Clarify thread safety by @ptiurin in #219
• feat: use trio for async_to_sync by @ptiurin in #220
• fix: Using cached-property instead of async by @ptiurin in #221
• fix: Engine is running check by @ptiurin in #204

Full Changelog: 0.12.0...0.13.0