DOC: add information on where to report vulnerabilities + pointer to HOWTO_Seek_Help

originally following command was used to add header to all config files:

  sed -ie '/# Author/ i\# Please report vulnerabilities to fail2ban-vulnerabilities at lists dot sourceforge dot net\n# and see http://www.fail2ban.org/wiki/index.php/HOWTO_Seek_Help for generic bug-reports.\n#' action.d/* filter.d/*

but it would be overkill ATM causing havoc in user-tuned configs -- postponed for now

Also adjusted the release date for today (by mistake in 1 commit ... sorry)

ChangeLog

@@ -4,10 +4,10 @@
                        |_| \__,_|_|_/___|_.__/\__,_|_||_|
 
 ================================================================================
-Fail2Ban (version 0.8.10)                                             2013/06/11
+Fail2Ban (version 0.8.10)                                             2013/06/12
 ================================================================================
 
-ver. 0.8.10 (2013/06/11) - wanna-be-secure
+ver. 0.8.10 (2013/06/12) - wanna-be-secure
 -----------
 
 Primarily bugfix and enhancements release, triggered by "bugs" in

README.md

@@ -2,7 +2,7 @@
                         / _|__ _(_) |_  ) |__  __ _ _ _  
                        |  _/ _` | | |/ /| '_ \/ _` | ' \ 
                        |_| \__,_|_|_/___|_.__/\__,_|_||_|
-                       v0.8.10                  2013/06/11
+                       v0.8.10                  2013/06/12
 
 ## Fail2Ban: ban hosts that cause multiple authentication errors
 
@@ -63,9 +63,14 @@ Code status:
 Contact:
 --------
 
+### You found a severe security vulnerability in Fail2Ban?
+email details to fail2ban-vulnerabilities at lists dot sourceforge dot net .
+
 ### You need some new features, you found bugs?
 visit [Issues](https://github.com/fail2ban/fail2ban/issues)
-and if your issue is not yet known -- file a bug report.
+and if your issue is not yet known -- file a bug report. See
+[Fail2Ban wiki](http://www.fail2ban.org/wiki/index.php/HOWTO_Seek_Help)
+on further instructions.
 
 ### You would like to troubleshoot or discuss?
 join the [mailing list](https://lists.sourceforge.net/lists/listinfo/fail2ban-users)