Forbid trailing whitespaces

.editorconfig

@@ -4,5 +4,5 @@ root = true
 indent_style = space
 indent_size = 4
 charset = utf-8
-trim_trailing_whitespace = false
+trim_trailing_whitespace = true
 insert_final_newline = true

.markdownlint.json

@@ -6,6 +6,5 @@
         "line_length": 1000
     },
     "MD024": false,
-    "MD032": false,
-    "MD009": false
+    "MD032": false
 }