Update README.md

Co-authored-by: Jens Wille <jens.wille@hbz-nrw.de>

README.md

@@ -718,9 +718,7 @@ Encodes a field value as URI. Aka percent-encoding.
 Options:
 
 - `plus_for_space`: Sets whether "space" (` `) will be substituted by a "plus" (`+`) or be percent escaped (`%20`). (Default: `true`)
-- `safe_chars`: Sets characters that won't be escaped. Safe characters are the
-ranges 0..9, a..z and A..Z. These are always safe and should not be specified.
-Default safe characters are also ".", "-", "*", and "_".
+- `safe_chars`: Sets characters that won't be escaped. Safe characters are the ranges 0..9, a..z and A..Z. These are always safe and should not be specified. (Default: `.-*_`)
 
 ```perl
 uri_encode("<sourceField>"[, <options>...])