Update pytest requirement from <5.5.0,>=5.2.2 to >=5.2.2,<6.1.0 (#910)

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/5.2.2...6.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

setup.py

@@ -67,7 +67,7 @@ setup(
     extras_require={
         "docs": ["sphinx_rtd_theme", "sphinx-autobuild"],
         "test": [
-            "pytest>=5.2.2,<5.5.0",
+            "pytest>=5.2.2,<6.1.0",
             "pytest-asyncio>=0.10,<0.15",
             "aiohttp~=3.6.2",
             "beautifulsoup4>=4.8.1,<4.10.0",