This plugin has gone close to a year without any updates. ProfliX's code contribution has bumped it up my to-do list, here we are
I haven't tested this update although it is highly likely it will work perfectly. If there's anything wrong I will address it promptly.

v2.3.0

• ProfliX added a new module: MobSilent!
  • This allows you to set which mobs should be permanently silent when they spawn in after the module is configured.
  • This module only runs on MC 1.9+, older versions don't have the required code to run it.
• ProfliX and I have made various improvements to the code - this plugin laid dormant whilst my programming ability improved since the previous update.