Format code with black, yapf, autopep8, isort and prettier

This commit fixes the style issues introduced in 2f38393 according to the output
from black, yapf, autopep8, isort and prettier.

Details: https://deepsource.io/gh/Helia-Developers/helia/transform/89bb64d5-5485-4661-b7c1-271d2a33cd25/

README.md

@@ -39,7 +39,6 @@ guidelines at https://github.com/pieckenst/helia/blob/master/CONTRIBUTING Source
 code on public github can be a bit behind hosted version since updates to it are
 pushed when enough changes pile up
 
-
 # Gitee mirror for mainland china /面向中国大陆的 Gitee 镜子
 
 We have a complete copy of this repository for mainland china folk up at gitee , the address of which is located at https://gitee.com/pieckenst/helia