Include newline in example log output

The example output was previously unreadable, since the log format
didn't include a newline. Perhaps related to the env_logger bump.

Author: benesch

examples/example_utils.rs

@@ -22,7 +22,7 @@ pub fn setup_logger(log_thread: bool, rust_log: Option<&str>) {
         let time_str = local_time.format("%H:%M:%S%.3f").to_string();
         write!(
             formatter,
-            "{} {}{} - {} - {}",
+            "{} {}{} - {} - {}\n",
             time_str,
             thread_name,
             record.level(),