EditorConfig: enable trimming trailing whitespace.

ForNeVeR · ForNeVeR · commit b5249f546642 · 2016-01-02T16:32:13.000+06:00
diff --git a/.editorconfig b/.editorconfig
@@ -4,4 +4,5 @@ root = true
 charset = utf-8
 indent_style = space
 indent_size = 4
+trim_trailing_whitespace = true
 insert_final_newline = true
