chore: update editorconfig

Author: kenjis

.editorconfig

@@ -1,8 +1,15 @@
+; This file is for unifying the coding style for different editors and IDEs.
+; More information at http://editorconfig.org
+
 root = true
 
 [*]
+charset = utf-8
+indent_size = 4
 indent_style = space
 end_of_line = lf
-charset = utf-8
-trim_trailing_whitespace = true
 insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{yml,yaml}]
+indent_size = 2