Update README.Fedora

Future versions of zmupdate will requite the Lock Tables permission.  Documentation updated accordingly.

distros/fedora/README.Fedora

@@ -25,7 +25,7 @@ New installs
    introduce an obvious security issue.  The following should set this up:
 
      mysql -u root -p
-     grant select,insert,update,delete,alter on zm.* to 
+     grant select,insert,update,delete,lock tables,alter on zm.* to 
      'zmuser'@localhost identified by 'zmpass';
 
    Obviously, change at least zmpass to an actual, secure password or