Release 5.1.0

Added

• Full-featured Test Case ID support by @pytest.mark.tc_id decorator, by @HardNorth
• Relative path code references for correct history inheritance, by @HardNorth
• Nested steps support, see docs, by @HardNorth

Fixed

• Multi-processing, multi-threading logging, by @HardNorth
• pytest-parallel support

Changed

• Hierarchy configuration flags, see README.md: https://github.com/reportportal/agent-python-pytest#configuration
• @pytest.mark.issue decorator now fully supports Report Portal's external issue feature, but lost multiple issue handling in some cases

Full Changelog: 5.0.12...5.1.0