Refresh docs dependencies

Author: mdmintz

mkdocs_build/requirements.txt

@@ -25,7 +25,7 @@ lunr==0.6.2
 nltk==3.7
 watchdog==2.1.9
 mkdocs==1.3.0
-mkdocs-material==8.3.6
+mkdocs-material==8.3.7
 mkdocs-exclude-search==0.6.4
 mkdocs-simple-hooks==0.1.5
 mkdocs-material-extensions==1.0.3