chore: Update release-it to the latest version 🚀 (#90)

## The devDependency [release-it](https://github.com/webpro/release-it) was updated from `8.4.3` to `9.0.0`.
This version is **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

---

<details>
<summary>Release Notes for Release 9.0.0</summary>

<ul>
<li>Add updates/changelog notice &amp; remove temp v8 notice (<a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/webpro/release-it/commit/ff75970fbe684bb76842472e5f265b1448d5ac22/hovercard" href="https://urls.greenkeeper.io/webpro/release-it/commit/ff75970fbe684bb76842472e5f265b1448d5ac22"><tt>ff75970</tt></a>)</li>
<li>Add demo for pre-releases (<a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/webpro/release-it/commit/fb9990c6f149ed73285c2fea56858b827aeae78a/hovercard" href="https://urls.greenkeeper.io/webpro/release-it/commit/fb9990c6f149ed73285c2fea56858b827aeae78a"><tt>fb9990c</tt></a>)</li>
</ul>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 39 commits ahead by 39, behind by 2.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/83f1f883037cd39db9462c59e9692ce60138c542"><code>83f1f88</code></a> <code>Release 9.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/ff75970fbe684bb76842472e5f265b1448d5ac22"><code>ff75970</code></a> <code>Add updates/changelog notice &amp; remove temp v8 notice</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/fb9990c6f149ed73285c2fea56858b827aeae78a"><code>fb9990c</code></a> <code>Add demo for pre-releases</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/fc1093ef3588f9eb316e69c80bd9ce7461ec0625"><code>fc1093e</code></a> <code>Release 9.0.0-beta.4</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/e4e04a7d103db9d62b493e60b69ce4e9871184b6"><code>e4e04a7</code></a> <code>Fix/clean up dist defaults</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/bc3b137862938327efa0200dbfb98a79667b9e1a"><code>bc3b137</code></a> <code>Indicate pre-release in github prompt</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/867f65c76e5cb1ec34ab1f4148c0a24a9dcca0e9"><code>867f65c</code></a> <code>Fix priority of <code>--npm.tag</code></code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/b15b85604b10851ad7664433c71ac535abf0c108"><code>b15b856</code></a> <code>Release 9.0.0-beta.3</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/7e2e9e712e30a0045a2f1285b7315e40a5dabd18"><code>7e2e9e7</code></a> <code>Minor refactorings</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/ec3e01086976e888cc4205adaea4aaa0ee878032"><code>ec3e010</code></a> <code>Fix npm tag for pre-release</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/3607e706b9cf40651e5d312848f56cba673594db"><code>3607e70</code></a> <code>Add link to repository dependents to readme</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/2ee03e5f1f07e850700ed287babddba03d11d847"><code>2ee03e5</code></a> <code>Update readme with note re. v8/9 (closes #415)</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/0d1ebb5d33da02f8027df062689162a4fa9b949a"><code>0d1ebb5</code></a> <code>Release 9.0.0-beta.2</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/47347c48cdad0321dbb495e1f6fbd7109159e13a"><code>47347c4</code></a> <code>Tweak readme</code></li>
<li><a href="https://urls.greenkeeper.io/webpro/release-it/commit/c0a210b4f8defbff13bc3488798a69c17c8484cf"><code>c0a210b</code></a> <code>Use actual un-mocked method in test</code></li>
</ul>
<p>There are 39 commits in total.</p>
<p>See the <a href="https://urls.greenkeeper.io/webpro/release-it/compare/5e3aec8b3ecb4753f588c2ea0acf3b6313a7c0ed...83f1f883037cd39db9462c59e9692ce60138c542">full diff</a></p>
</details>

<details>
  <summary>FAQ and help</summary>

  There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).
</details>

---


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Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "react": "16.6.1",
     "react-native": "^0.57.7",
     "react-test-renderer": "16.6.1",
-    "release-it": "^8.0.0",
+    "release-it": "^9.0.0",
     "strip-ansi": "^5.0.0",
     "typescript": "^3.1.1"
   },