Update pytest to 3.10.1 (#1318)

This PR updates [pytest](https://pypi.org/project/pytest) from **3.10.0** to **3.10.1**.



<details>
  <summary>Changelog</summary>
  
  
   ### 3.10.1
   ```
   ==========================

Bug Fixes
---------

- `4287 &lt;https://github.com/pytest-dev/pytest/issues/4287&gt;`_: Fix nested usage of debugging plugin (pdb), e.g. with pytester&#39;s ``testdir.runpytest``.


- `4304 &lt;https://github.com/pytest-dev/pytest/issues/4304&gt;`_: Block the ``stepwise`` plugin if ``cacheprovider`` is also blocked, as one depends on the other.


- `4306 &lt;https://github.com/pytest-dev/pytest/issues/4306&gt;`_: Parse ``minversion`` as an actual version and not as dot-separated strings.


- `4310 &lt;https://github.com/pytest-dev/pytest/issues/4310&gt;`_: Fix duplicate collection due to multiple args matching the same packages.


- `4321 &lt;https://github.com/pytest-dev/pytest/issues/4321&gt;`_: Fix ``item.nodeid`` with resolved symlinks.


- `4325 &lt;https://github.com/pytest-dev/pytest/issues/4325&gt;`_: Fix collection of direct symlinked files, where the target does not match ``python_files``.


- `4329 &lt;https://github.com/pytest-dev/pytest/issues/4329&gt;`_: Fix TypeError in report_collect with _collect_report_last_write.



Trivial/Internal Changes
------------------------

- `4305 &lt;https://github.com/pytest-dev/pytest/issues/4305&gt;`_: Replace byte/unicode helpers in test_capture with python level syntax.
   ```
   
  
</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

@@ -206,9 +206,9 @@ flake8==3.5.0 \
 mock==2.0.0 \
     --hash=sha256:5ce3c71c5545b472da17b72268978914d0252980348636840bd34a00b5cc96c1 \
     --hash=sha256:b158b6df76edd239b8208d481dc46b6afd45a846b7812ff0ce58971cf5bc8bba
-pytest==3.10.0 \
-    --hash=sha256:630ff1dbe04f469ee78faa5660f712e58b953da7df22ea5d828c9012e134da43 \
-    --hash=sha256:a2b5232735dd0b736cbea9c0f09e5070d78fcaba2823a4f6f09d9a81bd19415c
+pytest==3.10.1 \
+    --hash=sha256:3f193df1cfe1d1609d4c583838bea3d532b18d6160fd3f55c9447fdca30848ec \
+    --hash=sha256:e246cf173c01169b9617fc07264b7b1316e78d7a650055235d6d897bc80d9660
 coverage==4.5.1 \
     --hash=sha256:7608a3dd5d73cb06c531b8925e0ef8d3de31fed2544a7de6c63960a1e73ea4bc \
     --hash=sha256:3a2184c6d797a125dca8367878d3b9a178b6fdd05fdc2d35d758c3006a1cd694 \