Enforce 4-space indent to Markdown

Author: huangsam

.editorconfig

@@ -6,7 +6,7 @@ end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
 
-[*.{py,toml}]
+[*.{py,toml,md}]
 indent_size = 4
 indent_style = space