Enhancements:

• 7b3aa0f Default to 30s duration like net/http/pprof
• 90cb49f Make pprof the default format, remove guessing

Misc

• c14b6f4 example: Log addr on startup
• 517eaf9 README: Simplify goroutine point even further
• 1c69cbf README: Further clarify production overhead
• 2b17c88 Change email
• 4a3eb8f README: Clarify performance impact
• a841aca Remove dead code
• c9cb006 Properly fix brittle test
• 3295f6c Revert "Deal with test race"
• 6cc725c Clarify preemption limitation
• 033348e README: Add new section about the future
• bd0b668 Simplify sentence
• 12a2f32 Fix typo
• cf868fc Deal with test race
• 2bc69ff Fix more typos