Merge pull request #258 from nemchik/patch-2

Update requirements.txt

docs/requirements.txt

@@ -3,7 +3,9 @@ markdown==3.3.4
 mkdocs-awesome-pages-plugin==2.5.0
 mkdocs-git-revision-date-localized-plugin==0.9.2
 mkdocs-macros-plugin==0.5.5
+mkdocs-material-extensions==1.0.1
 mkdocs-material==7.1.7
+mkdocs-minify-plugin==0.4.0
 mkdocs-redirects==1.0.3
 mkdocs==1.1.2
 pygments==2.9.0