Update dependency jsdom to v15 (#244)

This PR contains the following updates:

| Package | Type | Update | Change | References |
|---|---|---|---|---|
| jsdom | devDependencies | major | [`14.1.0` -> `15.0.0`](https://diff.intrinsic.com/jsdom/14.1.0/15.0.0) | [source](https://togithub.com/jsdom/jsdom) |

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### Release Notes

<details>
<summary>jsdom/jsdom</summary>

### [`v15.0.0`](https://togithub.com/jsdom/jsdom/blob/master/Changelog.md#&#8203;1500)

[Compare Source](https://togithub.com/jsdom/jsdom/compare/14.1.0...15.0.0)

Several potentially-breaking changes, each of them fairly unlikely to actually break anything:

-   `JSOM.fromFile()` now treats `.xht` files as `application/xhtml+xml`, the same as it does for `.xhtml` and `.xml`. Previously, it would treat them as `text/html`.
-   If the `JSDOM` constructor's `contentType` option has a `charset` parameter, and the first argument to the constructor is a binary data type (e.g. `Buffer` or `ArrayBuffer`), then the `charset` will override any sniffed encoding in the same way as a `Content-Type` header would in browser scenarios. Previously, the `charset` parameter was ignored.
-   When using the `Blob` or `File` constructor with the `endings: "native"` option, jsdom will now convert line endings to `\n` on all operating systems, for consistency. Previously, on Windows, it would convert line endings to `\r\n`.

</details>

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package.json

@@ -61,7 +61,7 @@
     "eslint-plugin-jsx-a11y": "6.2.1",
     "eslint-plugin-react": "7.12.4",
     "fs-extra": "7.0.1",
-    "jsdom": "14.1.0",
+    "jsdom": "15.0.0",
     "nyc": "13.3.0",
     "parcel-bundler": "1.12.3",
     "parcel-plugin-inlinesvg": "0.1.1",