Update google-proto-files to the latest version 🚀 (#139)

## Version **0.16.0** of [google-proto-files](https://github.com/googleapis/nodejs-proto-files) was just published.

<table>
  <tr>
    <th align=left>
      Dependency
    </th>
    <td>
      <code>google-proto-files</code>
    </td>
  </tr>
  <tr>
      <th align=left>
       Current Version
      </th>
      <td>
        0.15.1
      </td>
    </tr>
  <tr>
    <th align=left>
      Type
    </th>
    <td>
      dependency
    </td>
  </tr>
</table>

The version **0.16.0** 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.

It might be worth looking into these changes and trying to get this project onto the latest version of google-proto-files.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.


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<details>
<summary>Release Notes</summary>
<strong>v0.16.0</strong>

<h2>Features</h2>
<ul>
<li>(<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="316092585" data-permission-text="Issue title is private" data-url="googleapis/nodejs-proto-files#35" href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/pull/35">#35</a>): Allow passing <code>load()</code> options to protobuf.js. (Thanks, <a class="user-mention" data-hovercard-user-id="583593" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://urls.greenkeeper.io/nmccready">@nmccready</a>!)</li>
</ul>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 19 commits.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/b4d00bd0b7e6c2d4e0be1395739ded62bd9083e3"><code>b4d00bd</code></a> <code>0.16.0 (#44)</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/47488981af49c1102737e60cad560f9609ac29d2"><code>4748898</code></a> <code>feat: allow load options (#35)</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/91a34aa6ec2fb31932a03f4ed7756210146ea163"><code>91a34aa</code></a> <code>Merge pull request #42 from googleapis/greenkeeper/nyc-12.0.1</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/fca6f7540c45b1ec3916602e1189cef289429908"><code>fca6f75</code></a> <code>Update package.json</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/f0473ada67034a0a294d3f15dd1aa968acb5750a"><code>f0473ad</code></a> <code>chore(package): update nyc to version 12.0.1</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/057563111be9bf9e97e02f893fbed08a9b465db2"><code>0575631</code></a> <code>chore: lock files maintenance (#41)</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/5f38e7f77b6c14a5bbc256acb598fe10f4dbb693"><code>5f38e7f</code></a> <code>chore: lock files maintenance (#38)</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/d077e0b86bf56135301a5240a15c4cbbabf2eb47"><code>d077e0b</code></a> <code>chore: test on node10 (#37)</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/7855ccaca6a1f323719ef2c5a6c77ddd06953cb6"><code>7855cca</code></a> <code>chore: lock files maintenance (#36)</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/e5548189863303d1973d54c5dc23d5eb599fbdaa"><code>e554818</code></a> <code>Merge pull request #32 from googleapis/greenkeeper/sinon-5.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/0ecbb5e631d5918b8e1cf09e6ab1b6ed6d3baa64"><code>0ecbb5e</code></a> <code>Update package locks</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/838e2d1d84db3e15a0a5a73242ac7399709d6a44"><code>838e2d1</code></a> <code>chore(package): update sinon to version 5.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/fb18058f58c906ff9e90be80d4f312dbfb9ff68f"><code>fb18058</code></a> <code>chore: workaround for repo-tools EPERM (#33)</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/cf5968e2974b0cecbb6a807ffde696ec37dd6fe6"><code>cf5968e</code></a> <code>chore: setup nighty build in CircleCI (#31)</code></li>
<li><a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/commit/c4c973a41ee5810052fb0159ae2f83c18e6f866f"><code>c4c973a</code></a> <code>chore(package): update proxyquire to version 2.0.0 (#30)</code></li>
</ul>
<p>There are 19 commits in total.</p>
<p>See the <a href="https://urls.greenkeeper.io/googleapis/nodejs-proto-files/compare/89183d7d25f9c7e3b9097da820d9d84bd803a92f...b4d00bd0b7e6c2d4e0be1395739ded62bd9083e3">full diff</a></p>
</details>

<details>
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