Make default regex for password characters more user-friendly (#1285)

- Change regex pattern per input of @sgdc3
- Add clarifying comments

docs/config.md

@@ -1,5 +1,5 @@
 <!-- AUTO-GENERATED FILE! Do not edit this directly -->
-<!-- File auto-generated on Mon Jul 10 21:39:00 CEST 2017. See docs/config/config.tpl.md -->
+<!-- File auto-generated on Sat Jul 15 19:32:28 CEST 2017. See docs/config/config.tpl.md -->
 
 ## AuthMe Configuration
 The first time you run AuthMe it will create a config.yml file in the plugins/AuthMe folder, 
@@ -197,8 +197,10 @@ settings:
         maxJoinPerIp: 0
         # AuthMe will NEVER teleport players if set to true!
         noTeleport: false
-        # Regex syntax for allowed chars in passwords
-        allowedPasswordCharacters: '[\x21-\x7E]*'
+        # Regex syntax for allowed chars in passwords. The default [!-~] allows all visible ASCII
+        # characters, which is what we recommend. See also http://asciitable.com
+        # You can test your regex with https://regex101.com
+        allowedPasswordCharacters: '[!-~]*'
         # Threshold of the other accounts command, a value less than 2 means disabled.
         otherAccountsCmdThreshold: 0
         # Command to run when a user has more accounts than the configured threshold.
@@ -532,4 +534,4 @@ To change settings on a running server, save your changes to config.yml and use
 
 ---
 
-This page was automatically generated on the [AuthMe/AuthMeReloaded repository](https://github.com/AuthMe/AuthMeReloaded/tree/master/docs/) on Mon Jul 10 21:39:00 CEST 2017
+This page was automatically generated on the [AuthMe/AuthMeReloaded repository](https://github.com/AuthMe/AuthMeReloaded/tree/master/docs/) on Sat Jul 15 19:32:28 CEST 2017