Full Changelog: v0.29.0...v0.30.0

Features

• Add @trio.as_safe_channel, a wrapper that can be used to make async generators safe.
  This will be the suggested fix for the flake8-async lint rule ASYNC900. (#3197)

Bugfixes

• Allow trio to be a types.ModuleType and still have deprecated attributes. (#2135)
• Fixed socket module for some older systems which lack socket.AI_NUMERICSERV.
  Now trio works on legacy (pre-Lion) macOS. (#3133)
• Update type hints for trio.run_process and trio.lowlevel.open_process. (#3183)
• Don't mutate the global runner when MockClock is created. (#3205)
• Fix incorrect return type hint for Nursery.start(). (#3224)

Improved documentation

• Update wording in documentation to more accurately reflect Trio's maturity. (#3216)