Bump freezegun from 1.4.0 to 1.5.0 (#35)

Summary:
Bumps [freezegun](https://github.com/spulec/freezegun) from 1.4.0 to 1.5.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/spulec/freezegun/blob/master/CHANGELOG">freezegun's changelog</a>.</em></p>
<blockquote>
<h2>1.5.0</h2>
<ul>
<li>The default ignore list now contains the <code>queue</code>-package</li>
<li>Added a missing <code>move_to</code>-function when calling <code>freeze_time(tick=True)</code></li>
<li>Fixes a rounding error in <code>time.time_ns()</code></li>
<li>Fixed a bug where the default ignore list could not be empty (<code>configure(default_ignore_list=[])</code>)</li>
<li>All <code>tick()</code> methods now return the new datetime (instead of None)</li>
<li>Type improvements</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/spulec/freezegun/commit/17ea422800fc72a6e507755f1cfbf6ec75ba0359"><code>17ea422</code></a> Admin: Release may not need to update version nr</li>
<li><a href="https://github.com/spulec/freezegun/commit/3b3326001384843a1bef604b62efe4e735ac25c3"><code>3b33260</code></a> Admin: Release 1.5.0 changelog</li>
<li><a href="https://github.com/spulec/freezegun/commit/45d92937673b77557aa2b2243e7e28c29ba43436"><code>45d9293</code></a> Merge pull request <a href="https://redirect.github.com/spulec/freezegun/issues/538">#538</a> from romuald/fix-time-ns-mock</li>
<li><a href="https://github.com/spulec/freezegun/commit/6f14dc3333585250c544f53eb67322f16b0f081a"><code>6f14dc3</code></a> Merge branch 'master' into fix-time-ns-mock</li>
<li><a href="https://github.com/spulec/freezegun/commit/5b6c4a20dc3f6512a60a4d644cf9e067738d1aff"><code>5b6c4a2</code></a> Merge pull request <a href="https://redirect.github.com/spulec/freezegun/issues/543">#543</a> from spulec/mypy</li>
<li><a href="https://github.com/spulec/freezegun/commit/aabe629cc6e34fd56e047b74eed27cc710457d96"><code>aabe629</code></a> MyPy</li>
<li><a href="https://github.com/spulec/freezegun/commit/dfd5d9e166d3149194fbd35daa07e2862c3f918c"><code>dfd5d9e</code></a> Merge pull request <a href="https://redirect.github.com/spulec/freezegun/issues/542">#542</a> from kingbuzzman/patch-1</li>
<li><a href="https://github.com/spulec/freezegun/commit/4ecad0ccb728a80797430a6382b1c3e7793bbbcc"><code>4ecad0c</code></a> Merge pull request <a href="https://redirect.github.com/spulec/freezegun/issues/540">#540</a> from encukou/fix-empty-ignore</li>
<li><a href="https://github.com/spulec/freezegun/commit/2436841269115d54e3abe412792b531a567ec85d"><code>2436841</code></a> Update test_datetimes.py</li>
<li><a href="https://github.com/spulec/freezegun/commit/673adf0e129ffe974fb573a3d8282d6fc5a661da"><code>673adf0</code></a> Update test_datetimes.py</li>
<li>Additional commits viewable in <a href="https://github.com/spulec/freezegun/compare/1.4.0...1.5.0">compare view</a></li>
</ul>
</details>
<br />

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</details>

Pull Request resolved: #35

Reviewed By: chantra

Differential Revision: D56492205

fbshipit-source-id: bf488d97bb5ae0ec7fe3e8a04b5101565702e23f