style: 设置默认4个空格为一个tab

.editorconfig

@@ -5,12 +5,12 @@ charset=utf-8
 end_of_line=lf
 insert_final_newline=true
 indent_style=space
-indent_size=2
+indent_size=4
 max_line_length = 100
 
 [*.{yml,yaml,json}]
 indent_style = space
-indent_size = 2
+indent_size = 4
 
 [*.md]
 trim_trailing_whitespace = false