Remove final new line from displayfile

subjects/displayfile.en.md

@@ -22,6 +22,5 @@ student@ubuntu:~/[[ROOT]]/displayfile$ ./displayfile quest8.txt main.go
 Too many arguments
 student@ubuntu:~/[[ROOT]]/displayfile$ ./displayfile quest8.txt
 Almost there!!
-
 student@ubuntu:~/[[ROOT]]/displayfile$
 ```

tests/go/solutions/displayfile/main.go

@@ -16,13 +16,9 @@ func main() {
 		return
 	}
 	fileName := os.Args[1]
-
 	data, err := ioutil.ReadFile(fileName)
-
 	if err != nil {
-		fmt.Println(err)
-		return
+		panic(err)
 	}
-
-	fmt.Println(string(data))
+	os.Stdout.Write(data)
 }