Bump multidict from 5.1.0 to 5.2.0 (#225)

Bumps [multidict](https://github.com/aio-libs/multidict) from 5.1.0 to 5.2.0.
- [Release notes](https://github.com/aio-libs/multidict/releases)
- [Changelog](https://github.com/aio-libs/multidict/blob/master/CHANGES.rst)
- [Commits](https://github.com/aio-libs/multidict/compare/v5.1.0...v5.2.0)

---
updated-dependencies:
- dependency-name: multidict
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -15,7 +15,7 @@ Jinja2==3.0.2
 lxml==4.6.3
 MarkupSafe==2.0.1
 mock==4.0.2
-multidict==5.1.0
+multidict==5.2.0
 pycountry==20.7.3
 PyPDF2==1.26.0
 PySocks==1.7.1