chore(deps): update dependency express to ^4.16.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
express	devDependencies	patch	^4.16.3 -> ^4.16.4	homepage, source

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Release Notes

expressjs/express

### [`v4.16.4`](https://renovatebot.com/gh/expressjs/express/blob/master/History.md#​4164--2018-10-10) [Compare Source](https://renovatebot.com/gh/expressjs/express/compare/4.16.3...4.16.4) =================== - Fix issue where `"Request aborted"` may be logged in `res.sendfile` - Fix JSDoc for `Router` constructor - deps: body-parser@1.18.3 - Fix deprecation warnings on Node.js 10+ - Fix stack trace for strict json parse error - deps: depd@~1.1.2 - deps: http-errors@~1.6.3 - deps: iconv-lite@0.4.23 - deps: qs@6.5.2 - deps: raw-body@2.3.3 - deps: type-is@~1.6.16 - deps: proxy-addr@~2.0.4 - deps: ipaddr.js@1.8.0 - deps: qs@6.5.2 - deps: safe-buffer@5.1.2

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