fix(deps): update dependency koa to v3.1.0 (#284)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [koa](https://koajs.com)
([source](https://redirect.github.com/koajs/koa)) | [`3.0.3` ->
`3.1.0`](https://renovatebot.com/diffs/npm/koa/3.0.3/3.1.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/koa/3.1.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/koa/3.1.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/koa/3.0.3/3.1.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/koa/3.0.3/3.1.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>koajs/koa (koa)</summary>

###
[`v3.1.0`](https://redirect.github.com/koajs/koa/blob/HEAD/History.md#253--2018-09-11)

[Compare
Source](https://redirect.github.com/koajs/koa/compare/v3.0.3...v3.1.0)

\==================

**fixes**

-
\[[`2ee32f5`](http://github.com/koajs/koa/commit/2ee32f50b88b383317e33cc0a4bfaa5f2eadead7)]
- fix: pin debug@\~3.1.0 avoid deprecated warnning
([#&#8203;1245](https://redirect.github.com/koajs/koa/issues/1245))
(fengmk2 <<fengmk2@&#8203;gmail.com>>)

**others**

-
\[[`2180839`](http://github.com/koajs/koa/commit/2180839eda2cb16edcfda46ccfe24711680af850)]
- docs: Update koa-vs-express.md
([#&#8203;1230](https://redirect.github.com/koajs/koa/issues/1230))
(Clayton Ray <<iamclaytonray@gmail.com>>)

</details>

---

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package.json

@@ -22,7 +22,7 @@
     "@graphile-contrib/pg-simplify-inflector": "6.1.0",
     "@koa/router": "14.0.0",
     "dotenv": "17.2.3",
-    "koa": "3.0.3",
+    "koa": "3.1.0",
     "koa-bodyparser": "4.4.1",
     "koa-compress": "5.1.1",
     "koa-helmet": "8.0.1",