Update dependency more-itertools to v8.4.0

Author: renovate-bot

requirements.txt

@@ -4,7 +4,7 @@ certifi==2020.6.20
 chardet==3.0.4
 idna==2.10
 loguru==0.5.1
-more-itertools==8.3.0
+more-itertools==8.4.0
 packaging==20.4
 pluggy==0.13.1
 py==1.8.1