Added:

• option to only log not-yet-seen invalid ips:
  log.unique
  
• option to log to extra file plugins/FakeMessageFix/log.txt instead of logging to console:
  log.extraFile
  
• option to hide kick in console (kick message might be motd or exception in that mode though):
  hideKickInConsoleButKickMessageIsMotdOrException

Changes:
New config, old config will be automatically migrated:
Other unimportant notes:
Version 1.1 includes all these changes but did not output the status of config option hideKickInConsoleButKickMessageIsMotdOrException and I noticed it too late, so v1.1 was already pushed to github, so I decided to increase version number again immediately.