Remove unnecessary runBlocking wrapper in README example

The `runBlocking` wrapper was removed to simplify the example code in the README file. This change makes the example more straightforward, focusing on the usage of the custom appender and tracing spans without the additional complexity of coroutine management.

README.md

@@ -133,34 +133,29 @@ class MyBatchAppender(size: Int) : BatchAppender<LoggingEvent>(size) {
     }
 }
 
-runBlocking {
-    delay(2000)
-    val appender = MyBatchAppender(5)
-    // Register the appender.
-    RootLogger.Logging.appenders.register(appender)
-
-    // Will print:
-    // 0, 1, 2, 3, 4
-    // 5, 6, 7, 8, 9
-    repeat(10) {
-        log.info("$it")
-        delay(500)
-    }
-
-    delay(2000)
-
-    // Starts immediately the span.
-    trace.span("test") {
-        // Send events that are related to the current span.
-        it.event("this is a test event")
-        // Automatically closes at the end of te scope.
-    }
+val appender = MyBatchAppender(5)
+// Register the appender.
+RootLogger.Logging.appenders.register(appender)
+
+// Will print:
+// 0, 1, 2, 3, 4
+// 5, 6, 7, 8, 9
+repeat(10) {
+    log.info("$it")
+    delay(500)
+}
 
-    // Create the span and then start it.
-    val span: TracingEvent.Span = trace.span("test").start()
-    span.event("this is a test event")
-    span.tracer
-    // Close the span manually.
-    span.end()
+// Starts immediately the span.
+trace.span("test") {
+    // Send events that are related to the current span.
+    it.event("this is a test event")
+    // Automatically closes at the end of te scope.
 }
+
+// Create the span and then start it.
+val span: TracingEvent.Span = trace.span("test").start()
+span.event("this is a test event")
+span.tracer
+// Close the span manually.
+span.end()
 ```