Fix missing newline after TLS warning

main.go

@@ -198,7 +198,7 @@ func main() {
 				}
 			}()
 		} else {
-			fmt.Printf("Warning: no valid TLS configuration was provided, not binding on %s", config.BindSecure)
+			log.Printf("Warning: no valid TLS configuration was provided, not binding on %s", config.BindSecure)
 		}
 	}