Disable editor hard wrapping for .rst and .md files.

The .md and .rst files allready present do not hard wrap lines (the
style seems to be one line per paragraph, which could be a few hundred
characters long). So this makes those files have no line length limit,
instead of 100.

.editorconfig

@@ -13,6 +13,7 @@ max_line_length = 100
 indent_style = tab
 
 [*.{md,rst}]
+max_line_length = unset
 trim_trailing_whitespace = false
 
 [*.sh]