Bump astroid from 2.5.7 to 2.5.8 (#73)

Bumps [astroid](https://github.com/PyCQA/astroid) from 2.5.7 to 2.5.8.
- [Release notes](https://github.com/PyCQA/astroid/releases)
- [Changelog](https://github.com/PyCQA/astroid/blob/master/ChangeLog)
- [Commits](pylint-dev/astroid@v2.5.7...v2.5.8)

---
updated-dependencies:
- dependency-name: astroid
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 appdirs==1.4.4
-astroid==2.5.7
+astroid==2.5.8
 atomicwrites==1.4.0
 attrs==21.2.0
 black==21.5b2