Update pytest to 4.0.2 (#1415)

This PR updates [pytest](https://pypi.org/project/pytest) from **4.0.1** to **4.0.2**.



<details>
  <summary>Changelog</summary>
  
  
   ### 4.0.2
   ```
   =========================

Bug Fixes
---------

- `4265 &lt;https://github.com/pytest-dev/pytest/issues/4265&gt;`_: Validate arguments from the ``PYTEST_ADDOPTS`` environment variable and the ``addopts`` ini option separately.


- `4435 &lt;https://github.com/pytest-dev/pytest/issues/4435&gt;`_: Fix ``raises(..., &#39;code(string)&#39;)`` frame filename.


- `4500 &lt;https://github.com/pytest-dev/pytest/issues/4500&gt;`_: When a fixture yields and a log call is made after the test runs, and, if the test is interrupted, capture attributes are ``None``.


- `4538 &lt;https://github.com/pytest-dev/pytest/issues/4538&gt;`_: Raise ``TypeError`` for ``with raises(..., match=&lt;non-None falsey value&gt;)``.



Improved Documentation
----------------------

- `1495 &lt;https://github.com/pytest-dev/pytest/issues/1495&gt;`_: Document common doctest fixture directory tree structure pitfalls
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/pytest
  - Changelog: https://pyup.io/changelogs/pytest/
  - Homepage: https://docs.pytest.org/en/latest/
</details>

requirements.txt

@@ -205,9 +205,9 @@ flake8==3.5.0 \
 mock==2.0.0 \
     --hash=sha256:5ce3c71c5545b472da17b72268978914d0252980348636840bd34a00b5cc96c1 \
     --hash=sha256:b158b6df76edd239b8208d481dc46b6afd45a846b7812ff0ce58971cf5bc8bba
-pytest==4.0.1 \
-    --hash=sha256:ca4761407f1acc85ffd1609f464ca20bb71a767803505bd4127d0e45c5a50e23 \
-    --hash=sha256:1d131cc532be0023ef8ae265e2a779938d0619bb6c2510f52987ffcba7fa1ee4
+pytest==4.0.2 \
+    --hash=sha256:f812ea39a0153566be53d88f8de94839db1e8a05352ed8a49525d7d7f37861e9 \
+    --hash=sha256:f689bf2fc18c4585403348dd56f47d87780bf217c53ed9ae7a3e2d7faa45f8e9
 coverage==4.5.2 \
     --hash=sha256:06123b58a1410873e22134ca2d88bd36680479fe354955b3579fb8ff150e4d27 \
     --hash=sha256:09e47c529ff77bf042ecfe858fb55c3e3eb97aac2c87f0349ab5a7efd6b3939f \