udp buffer fix

index.js

 const udp = require('dgram')
-const buffer = require('buffer')
+const Buffer = require('buffer')
 const graylog = udp.createSocket('udp4')
 
 function Log (options) {
@@ -121,13 +121,18 @@ function Log (options) {
       })
     }
     if (this.options.graylog && this.options.graylog.active) {
-      graylog.send(Buffer.from(JSON.stringify({
+      let buffed = Buffer.from(JSON.stringify({
         short_message: message,
         timestamp: Date.now() / 1000,
         hostname: this.hostname,
         facility: this.name,
         level:tag
-        })), this.options.graylog.port, this.options.graylog.server, function(error){})
+        }))
+      graylog.send(buffed, this.options.graylog.port, this.options.graylog.server, function(error){
+          if (error) {
+            console.error(error)
+          }
+        })
     }
     return msg
   }