Remove unused plugin
Remove unused plugin

redpen-cc/redpen,kenhys/redpen,tatamiya3/redpen,recruit-tech/redpen,tatamiya3/redpen,recruit-tech/redpen,tatamiya3/redpen,redpen-cc/redpen,tatamiya3/redpen,kenhys/redpen,gerryhocks/redpen,kenhys/redpen,gerryhocks/redpen,gerryhocks/redpen,gerryhocks/redpen,redpen-cc/redpen,redpen-cc/redpen,redpen-cc/redpen,kenhys/redpen,recruit-tech/redpen,recruit-tech/redpen