Editorconfig: use 4 spaces for .toml indent

Author: webmaster128

.editorconfig

@@ -10,5 +10,8 @@ insert_final_newline = true
 [*.rs]
 indent_size = 4
 
+[*.toml]
+indent_size = 4 # For compliance with our taplo config
+
 [*.py]
 indent_size = 4