change error handling

main.go

@@ -23,7 +23,12 @@ func main() {
 	for tweet := range tweetchannel {
 		fmt.Println(tweet)
 		for _, output := range outputs {
-			output.Write(tweet)
+			err := output.Write(tweet)
+			if err != nil {
+				errstr := fmt.Sprintf("%s Error: %s", output.GetName(), err)
+				fmt.Fprintln(os.Stderr, errstr)
+				d.Write(errstr)
+			}
 		}
 	}
 }