Bump pytest-trio from 0.5.2 to 0.6.0 (#194)

Bumps [pytest-trio](https://github.com/python-trio/pytest-trio) from 0.5.2 to 0.6.0.
- [Release notes](https://github.com/python-trio/pytest-trio/releases)
- [Commits](python-trio/pytest-trio@v0.5.2...v0.6.0)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -3,7 +3,7 @@ codacy-coverage==1.3.11
 mock==3.0.5
 pytest-cov==2.10.0
 pytest-tornasync==0.6.0.post2; python_version >= '3.5'
-pytest-trio==0.5.2; python_version>="3.6"
+pytest-trio==0.6.0; python_version>="3.6"
 pytest==4.6.6; python_version<"3.5"
 pytest==5.4.3; python_version>="3.5"
 six==1.15.0