Fix composer.json editor config

Author: m1r0

.editorconfig

@@ -13,10 +13,16 @@ trim_trailing_whitespace = true
 [*.{md,txt,json,yml}]
 trim_trailing_whitespace = false
 
-[*.{json}]
+[*.json]
 indent_size = 2
 tab_width = 2
 
 [*.{json,yml}]
 insert_final_newline = false
 indent_style = space
+
+[composer.json]
+indent_size = 4
+tab_width = 4
+indent_style = tab
+insert_final_newline = true