fix(deps): update dependency koa-session to v5.12.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
koa-session	dependencies	patch	5.12.0 -> 5.12.2

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Release Notes

koajs/session

### [`v5.12.2`](https://togithub.com/koajs/session/blob/master/History.md#​5122--2019-07-10) [Compare Source](https://togithub.com/koajs/session/compare/5.12.1...5.12.2) ================== **fixes** - \[[`c23bab4`](http://github.com/koajs/session/commit/c23bab4023b95c65be46b4eeaf089608ddaa738e)] - fix: remvoe unused code (dead-horse >) ### [`v5.12.1`](https://togithub.com/koajs/session/blob/master/History.md#​5121--2019-07-10) [Compare Source](https://togithub.com/koajs/session/compare/5.12.0...5.12.1) ================== **fixes** - \[[`77968e3`](http://github.com/koajs/session/commit/77968e3ff6fb5d4f4a36665474ccd992fed689ec)] - fix: ensure ctx.session always has value (dead-horse >)

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Branch automerge failure

This PR was configured for branch automerge, however this is not possible so it has been raised as a PR instead.

[coveralls]

Coverage remained the same at 80.638% when pulling 8f19b9954ce62236b94190cad47cf12262566d2c on renovate/koa-session-5.x into 88bf98b3b3c42dbb7c8d3ad2a827474364455760 on master.

[coveralls]

Coverage remained the same at 80.638% when pulling 8f19b9954ce62236b94190cad47cf12262566d2c on renovate/koa-session-5.x into 88bf98b3b3c42dbb7c8d3ad2a827474364455760 on master.