Simple formatter which only displays the message.
     
  
  
  
  
  
  
    
    Methods
    
      
        - C
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Instance Public methods
      
        
          
            
              call(severity, timestamp, progname, msg)
            
            Link
          
          
            
              This method is invoked when a log event occurs
             
          
          
          
          
            
            
              
              
                 Source: 
                
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                  on GitHub
                
              
              
                
def call(severity, timestamp, progname, msg)
  "#{String === msg ? msg : msg.inspect}\n"
end