fix(deps): update dependency koa to v2.11.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
koa	dependencies	minor	2.8.1 -> 2.11.0

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Release Notes

koajs/koa

### [`v2.11.0`](https://togithub.com/koajs/koa/blob/master/History.md#​2110--2019-10-28) [Compare Source](https://togithub.com/koajs/koa/compare/2.10.0...2.11.0) ================== **features** - \[[`422e539`](http://github.com/koajs/koa/commit/422e539e8989e65ba43ecc39ddbaa3c4f755d465)] - feat: support app.proxyIPHeader and app.maxIpsCount to make ctx.ips more security (Yiyu He >) - \[[`d48d88e`](http://github.com/koajs/koa/commit/d48d88ee17b780c02123e6d657274cab456e943e)] - feat: implement response.has ([#​1397](https://togithub.com/koajs/koa/issues/1397)) (Konstantin Vyatkin >) **others** - \[[`4dc56f6`](http://github.com/koajs/koa/commit/4dc56f6d04e8f5fe12ba53a8a776653b3d7b60ed)] - chore: update ESLint and plugins/configs ([#​1407](https://togithub.com/koajs/koa/issues/1407)) (Konstantin Vyatkin >) - \[[`be7d334`](http://github.com/koajs/koa/commit/be7d334778481639294cdf87f5c359a230aeb65b)] - chore: removes code duplication at handling HEAD method ([#​1400](https://togithub.com/koajs/koa/issues/1400)) (Konstantin Vyatkin >) - \[[`f155785`](http://github.com/koajs/koa/commit/f155785e2bb42b5ddf0a8156401c6dafdf57ba8b)] - chore: support `writableEnded` ([#​1402](https://togithub.com/koajs/koa/issues/1402)) (Konstantin Vyatkin >) - \[[`b968688`](http://github.com/koajs/koa/commit/b968688afe2c727ae141f50aa983d481dbc1dbbf)] - chore: add FUNDING.yml ([#​1403](https://togithub.com/koajs/koa/issues/1403)) (Konstantin Vyatkin >) - \[[`4f96829`](http://github.com/koajs/koa/commit/4f968298f97394e488297ec32c8e927a3a322076)] - chore: remove isJSON in res.length ([#​1399](https://togithub.com/koajs/koa/issues/1399)) (Konstantin Vyatkin >) - \[[`8be5626`](http://github.com/koajs/koa/commit/8be5626bbb54e6c899a1b71d22411709126d9fea)] - build: enable codecov partial coverage and use bash uploader ([#​1396](https://togithub.com/koajs/koa/issues/1396)) (Konstantin Vyatkin >) - \[[`ef5c43b`](http://github.com/koajs/koa/commit/ef5c43bcbcf31819e032c3b7ae7654b7f8e9358b)] - chore: use rest params ([#​1393](https://togithub.com/koajs/koa/issues/1393)) (Konstantin Vyatkin >) ### [`v2.10.0`](https://togithub.com/koajs/koa/blob/master/History.md#​2100--2019-10-12) [Compare Source](https://togithub.com/koajs/koa/compare/2.9.0...2.10.0) ================== **features** - \[[`d7f7f77`](http://github.com/koajs/koa/commit/d7f7f77689e2eaef050686be2bdf3e72881a79ac)] - feat: support sameSite=none cookies (bump cookies dependency) ([#​1390](https://togithub.com/koajs/koa/issues/1390)) (Filip Skokan >) ### [`v2.9.0`](https://togithub.com/koajs/koa/blob/master/History.md#​290--2019-10-12) [Compare Source](https://togithub.com/koajs/koa/compare/2.8.2...2.9.0) ================== **features** - \[[`2d1c598`](http://github.com/koajs/koa/commit/2d1c5981869e0fe6f5bc71b5c5582accfd125cc6)] - feat: export HttpError from http-errors library (Micheal Hill >) **others** - \[[`cf70dbc`](http://github.com/koajs/koa/commit/cf70dbc6d2ba62bf1eb12b563dd5ecd27af6e2be)] - Chore: Use https in readme ([#​1389](https://togithub.com/koajs/koa/issues/1389)) (谭九鼎 >) ### [`v2.8.2`](https://togithub.com/koajs/koa/blob/master/History.md#​282--2019-09-28) [Compare Source](https://togithub.com/koajs/koa/compare/2.8.1...2.8.2) ================== **fixes** - \[[`54e8fab`](http://github.com/koajs/koa/commit/54e8fab3e3d907bbb264caf3e28a24773d0d6fdb)] - fix: encode redirect url if not already encoded ([#​1384](https://togithub.com/koajs/koa/issues/1384)) (fengmk2 >) **others** - \[[`817b498`](http://github.com/koajs/koa/commit/817b49830571b45a8aec6b1fc1525434f5798c58)] - test: fix body test ([#​1375](https://togithub.com/koajs/koa/issues/1375)) (Robert Nagy >) - \[[`f75d445`](http://github.com/koajs/koa/commit/f75d4455359ecdf30eeb676e2c7f31d4cf7b42ed)] - test: fix end after end ([#​1374](https://togithub.com/koajs/koa/issues/1374)) (Robert Nagy >)

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[coveralls]

Coverage remained the same at 80.638% when pulling 2f5288b32e43fc6cf8eeedfff18be519f9e63962 on renovate/koa-2.x into 506fedbbbf5591e2f31c142982fc45cd7bb2cbd8 on master.