Update dependency ava to v1.2.0 (#133)

This PR contains the following updates:

| Package | Type | Update | Change | References |
|---|---|---|---|---|
| ava | devDependencies | minor | `1.1.0` -> `1.2.0` | [homepage](https://ava.li), [source](https://togithub.com/avajs/ava) |

---

### Release Notes

<details>
<summary>avajs/ava</summary>

### [`v1.2.0`](https://togithub.com/avajs/ava/releases/v1.2.0)

[Compare Source](https://togithub.com/avajs/ava/compare/v1.1.0...v1.2.0)

#### New features

You can now set a timeout for test themselves. The test will fail if this timeout is exceeded. The timeout is reset each time an assertion is made:

```js
test('foo', t => {
	t.timeout(100); // 100 milliseconds
	// Write your assertions here
});
```

[`b65c6d7`](https://togithub.com/avajs/ava/commit/b65c6d7da8ba3c7274f36dbcbcff26485f27d36f)

AVA also has a global [timeout feature](https://togithub.com/avajs/ava/blob/master/docs/07-test-timeouts.md). The mini reporter now logs tests that were pending when those timeouts occur. Additionally, if you interrupt a test using <kbd>ctrl+c</kbd> we'll now also show the pending tests. [`2b60556`](https://togithub.com/avajs/ava/commit/2b60556360bb3b434ee5b4bb3486acb8a32b7aa7)

Thank you [@&#8203;dflupu](https://togithub.com/dflupu) for your hard work on this!

#### Bug fixes and other improvements

-   We're no longer truncating multi-line error messages [`72e0762`](https://togithub.com/avajs/ava/commit/72e0762d9accb937b7b32f9151fe4088d194c710)
-   Unexpected errors in the throws assertions are now reported with the correct stack trace [`ad087f2`](https://togithub.com/avajs/ava/commit/ad087f250fe22878ab40f7855a079cf005818464)
-   The [Debugging with VSCode](https://togithub.com/avajs/ava/blob/master/docs/recipes/debugging-with-vscode.md) recipe has been updated with the correct `workspaceFolder` variable [`0a5fe42`](https://togithub.com/avajs/ava/commit/0a5fe429ca37c025a15c5af919827436cc413abc) and `--serial` argument placement [`edfc005`](https://togithub.com/avajs/ava/commit/edfc0055fea4fc204ac98c391baaa2ad60b41079)

#### All changes 📚

[`v1.1.0...v1.2.0`](https://togithub.com/avajs/ava/compare/v1.1.0...v1.2.0)

#### Thanks 💌

💖 Huge thanks to [@&#8203;anishkny](https://togithub.com/anishkny), [@&#8203;CrispusDH](https://togithub.com/CrispusDH), [@&#8203;dflupu](https://togithub.com/dflupu) and [@&#8203;niktekusho](https://togithub.com/niktekusho) for helping us with this release. We couldn’t have done it without you!

#### Get involved ✌️

We welcome new contributors. AVA is a friendly place to get started in open source. We have a [great article](https://medium.com/@&#8203;vadimdemedes/making-your-first-contribution-de6576ddb190#.umxr7id07) on getting started contributing and a comprehensive [contributing guide](https://togithub.com/avajs/ava/blob/master/contributing.md).

</details>

---

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