Update pytest to 4.4.1 (#337)

This PR updates [pytest](https://pypi.org/project/pytest) from **4.4.0** to **4.4.1**.



<details>
  <summary>Changelog</summary>
  
  
   ### 4.4.1
   ```
   =========================

Bug Fixes
---------

- `5031 &lt;https://github.com/pytest-dev/pytest/issues/5031&gt;`_: Environment variables are properly restored when using pytester&#39;s ``testdir`` fixture.


- `5039 &lt;https://github.com/pytest-dev/pytest/issues/5039&gt;`_: Fix regression with ``--pdbcls``, which stopped working with local modules in 4.0.0.


- `5092 &lt;https://github.com/pytest-dev/pytest/issues/5092&gt;`_: Produce a warning when unknown keywords are passed to ``pytest.param(...)``.


- `5098 &lt;https://github.com/pytest-dev/pytest/issues/5098&gt;`_: Invalidate import caches with ``monkeypatch.syspath_prepend``, which is required with namespace packages being used.
   ```
   
  
</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>

Pipfile

@@ -17,6 +17,6 @@ requests = "==2.21.0"
 coverage = "==4.5.3"
 flake8 = "==3.7.7"
 pyjokes = "==0.5.0"
-pytest = "==4.4.0"
+pytest = "==4.4.1"
 pytest-cov = "==2.6.1"
 pytest-flake8 = "==1.0.4"

requirements-test.txt

@@ -1,6 +1,6 @@
 coverage==4.5.3
 flake8==3.7.7
 pyjokes==0.5.0
-pytest==4.4.0
+pytest==4.4.1
 pytest-cov==2.6.1
 pytest-flake8==1.0.4