Added configuration for python into .editorconfig (dmlc#3494)

* Added configuration for python into .editorconfig

* Fixed forgotten change in the number of spaces

Author: KOLANICH

.editorconfig

@@ -4,4 +4,8 @@ root = true
 charset=utf-8
 indent_style = space
 indent_size = 2
-insert_final_newline = true
+insert_final_newline = true
+
+[*.py]
+indent_style = space
+indent_size = 4