4.5.0

• add deprecation message to non-plural req.accepts*
• add deprecation message to res.send(body, status)
• add deprecation message to res.vary()
• add headers option to res.sendfile
  • use to set headers on successful file transfer
• add mergeParams option to Router
  • merges req.params from parent routes
• add req.hostname -- correct name for what req.host returns
• deprecate things with depd module
• deprecate req.host -- use req.hostname instead
• fix behavior when handling request without routes
• fix handling when route.all is only route
• invoke router.param() only when route matches
• restore req.params after invoking router
• use finalhandler for final response handling
• use media-typer to alter content-type charset
• deps: accepts@~1.0.7
• deps: send@0.5.0
  • Accept string for maxage (converted by ms)
  • Include link in default redirect response
• deps: serve-static@~1.3.0
  • Accept string for maxAge (converted by ms)
  • Add setHeaders option
  • Include HTML link in redirect response
  • deps: send@0.5.0
• deps: type-is@~1.3.2