Bump mkdocs from 0.16.1 to 1.2.3 (#78)

Bumps [mkdocs](https://github.com/mkdocs/mkdocs) from 0.16.1 to 1.2.3.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](mkdocs/mkdocs@0.16.1...1.2.3)

---
updated-dependencies:
- dependency-name: mkdocs
  dependency-type: direct:production
...

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-mkdocs==0.16.1
+mkdocs==1.2.3
 mkdocs-material==1.0.2
 Pygments==2.7.4
 pymdown-extensions==1.6.1