Release v0.19.2

Bug Fixes

• Make comments at end of pipe() work correctly in the formatter (fcfb8db)
• Minor formatter fixes (30d1669)

Features

• Add location for ContextTooWeak error (d0d4e93)
• First limited working version of debug symbols (f7a7cd8)
• LLVM 12 transition looks good (1fae8c0)
• meaningful progress on debug annotations for llvm backend (8fb4e35)