2.4.1

• Remove usage of res._headers private field
• deps: fresh@0.5.0
  • Fix incorrect result when If-None-Match has both * and ETags
  • Fix weak ETag matching to match spec
  • perf: skip checking modified time if ETag check failed
  • perf: skip parsing If-None-Match when no ETag header
  • perf: use Date.parse instead of new Date